Posts Tagged ‘laing’

Welcome to my “living” review/preview of the Swiftech MCP 655-PWM DRIVE. What do you get when you couple our most reliable, most silent, and most cool running pump with PWM technology?

A Swiftech MCP 655 PWM-DRIVE!

I have been using D5 variants for about 5 years now and have always admired them as probably being the most tried and true pump out there serving many systems for 5 years + and going strong.

Swiftech-MCP-655-PWM-Drive0

However, I have also recently come to admire having PWM control over pumps such as the Swiftech MCP-35X in which I was able to automatically speed up and slow down the pump to meet thermal demands. PWM is also of value for special reservoir tops and other cramped installations where manually getting to the pump speed control is difficult after installation.

With the added PWM features, you no longer need to touch the pump physically to change speeds and you now have the flexibility to control it manually or automatically through a variety of PWM controlling software.

A special thanks to Mark from Frozen CPU for sponsoring the pump used in this review.

frozencpu_logo

Manufacturer Description & Specifications

http://www.frozencpu.com/products/17549/ex-pmp-214/Swiftech_MCP655-PWM_12v_Water_Pump_Module_-_PWM_Enabled_Single_Version.html

In response to the overwhelming demand and popularity of the MCP655 Series FrozenCPU.com has worked with Swiftech to bring you a more versatile version. Want your pump to run as quiet as possible? Now you can have that as well as the available power of the MCP655 in the all new MCP655-PWM. That is right, a PWM version on the MCP655!!

The MCP655 pump is a high reliability, high pressure industrial pump, featuring a 50,000 hour MTBF (5 year lifetime). Such reliability is afforded by the unique design of this pump, which contains only one moving part: the magnetically driven spherical impeller spins on a single ceramic bearing, thus extending the life of this pump beyond existing standards.

The pump is completely plug-and-play, and connects directly to any computer power-supply through standard 4 pin power connectors and a PWM 4-Pin header. It’s compact design, quiet and powerful motor make it ideally suited for heavy duty cooling in environments where space is at a premium.

This pump comes stock without any housing allowing you to integrate any of your favorite pump tops and pump accessories.

  • 50,000 hours MTBF (Mean Time Between Failure) equivalent to 5 years lifetime
  • Superior 12 Volts DC convenience: plugs into the computer power supply
  • The MCP655-PWM can be used with full confidence in any MP servers, and high-end workstations
  • Superior real world performance versus any aquarium pump we have tested to this date
  • The high pressure capability of the MCP655-PWM is particularly well adapted to high-flow systems using 1/2″ ID or 3/8″ ID Tubing
  • Compact Design
  • No maintenance when used with de-mineralized water, and anti-fungal additives (Swiftech HydrX additive is recommended)
Nominal voltage: 12 V DC
Operating voltage range: 8 to 24 VDC
Nominal power (@ 12 V): 37 W Max
Nominal current (@ 12 V): 2 amps
Motor type: Brushless, microprocessor controlled
Maximum head: 13 ft (4 m)
Maximum discharge: ~ 317 GPH (1200 LPH)
Performance will vary based on housing used

So, the hydraulic specs appear to be the same as the MCP 655, however there are some minor differences in the nominal power rating of 37W and operating voltage. The 13ft of maximum head is right in line with what I have measured myself with other D5 variants, but power consumption for my test bench has typically toped out around 21 watts or so depending on restriction.

We’ll have to put it through the ringer of tests and see how it compares. Perhaps there are some differences in RPM scaling over the vario model and perhaps the PWM feature allows a greater range of RPM operation.

XSPC D5 Dual Bay Reservoir Combo

Posted: December 6, 2012 in Pumps
Tags: , , , , , , , ,

This is review of the XSPC D5 Dual Bay Reservoir Combo. This is another “Durable” option in the bay reservoir pump craze. While XPSC has had a few acrylic options, this is an all new D5 model molded with a tough nylon material that is internally accessible for cleaning via one large top cover and it has a small acrylic window. Up until this reservoir option came out though, getting your hands on a more durable material option usually meant spending over $100, but not so here…it’s about half that. Any while most reservoir tops for the D5 so far have only made very minor improvements. This bay reservoir hit several notes in performance due maintaining a nice spiral shaped volute, removing much of the exit elbow, and improving the inlet port to a more desirable size.

A special thanks to Paul from XSPC for providing the review sample:

XSPC-DualBayD5Res-01

Manufacturer Specifications:

http://www.xs-pc.com/products/pumps/d5-dual-bay-reservoirpump-combo/

– G1/4″ Threads
– Brushed Aluminium Faceplate
– Tough Nylon Body
– 1x 5mm LED hole
– Individually Pressure Tested
– Capacity 300ml
– Dimensions: 149 x 85.6 x 105mm

Supplied with black faceplate, 8 screws, and blue LED.

Probably one of two most popular pumps in all of watercooling, the Koolance PMP-450 is a D5 Vario pump and packs a very strong amount of pumping power while retaining it’s built in variable speed controller.  There are multiple flavors of this pump and I have personally used the D5 series ever since my first loop watercooling several years ago.  Koolance has taken this very popular variable speed pump and added what it has been missing for far too long…an RPM sensing wire.

I would like to give special thanks to Tim from Koolance for sponsoring this powerful pump:

Overview

Koolance offers two flavors of the PMP-450 pumps.  One is the subject PMP-450 pump with variable speed control and the second is the PMP-450S pump which is fixed and designed to run at high voltage and higher speeds.

The pump comes in a factory box as a “Bare Pump” type product.

Box indicates it is a Laing D5-38/810 vario with 1/2″ barbs

Well packaged bare pump, no accessories

Both flavors of the pump share the exact same pump housing with the exception of the rear cup in which the PMP-450 has a hole where the variable speed control protrudes.

Variable speed controller and a BLUE RPM WIRE!!!!!

What’s different about the Koolance Brand pump?

There is one thing that I had always very much missed with various other D5 Vario pumps, and that’s the RPM sensor wire.  I’ve have several non Koolance brand variable speed D5 pumps now and none of them ever came with this very valuable feature.  As far as I know, Koolance is the only one to offer a variable speed Laing D5 that comes factory with the blue wire 3 pin RPM sensing wire.

Why is RPM sensing important?

RPM readout provides two important bits of information:

  • Pump and Loop Health Indicator – Having the ability to read RPM is a good way to see the pump is functioning as it was designed.  Sudden changes in RPM are indicators that either something has changed in the loop (IE a block is plugging), or that the pump is experiencing problems.  Without the ability to monitor via RPM, you are left with very little indication.
  • Pump Failure Shutdown – RPM is likely the easiest method of setting up an emergency pump shutdown routine.  Most motherboards and bios tools have some ability to set a minimum RPM level for the CPU fan header.  While this was originally intended to serve as a failsafe for CPU heat sink fans, it also works for pumps that have RPM sensing abilities.  While the D5 series may very well be the most trusted pump in all of watercooling, it’s always good practice to have a failsafe.  Running two pumps in series can give you redundancy, but what happens if you have a single pump and the pump fails…bad things can happen.  I personally have had an instance where I was working on my case and accidentally bumped a loose molex connector only to have the pump quit working.  My 8800GTX video card loop actually melted the acetal in my VGA block and the tubing had deformed to the point that it was nearly ready to burst.  Luckily I was right there looking and noticed the water boiling in my loop after getting a sense of some odd smell.  Had the tubing burst, surely there would have been disaster.  Having had the pump on a shutdown routine, would have prevented that.

Soo…I’m extremely happy that Koolance has now provided us with a D5 Vario WITH RPM sensor!  That’s awesome!

With that, let’s look around the pump.  It does come with a nice steel base which lifts the pump off the ground.  This metal base is ideal for sitting on a decoupling material since there will be no issue with heat.

1/2″ barbs come factory, no need to install a top for larger tubing

Now, let’s have a look on the inside, first and overall parts picture:

Tool-less disassembly reveals the goods, Ceramic/Carbon ball bearing, spiral volute

Another nice features of the PMP-450 is the completely tool-less ability to take the pump apart.  The pump is held in place by the large ribbed collar which simply unscrews with the twist of the hand.  The large o-ring you see sits in the volute housing and seals the metal pump housing to the thermoplastic volute.

At the heart of the pump and common to all D5 & DDC pumps is the very desirable ceramic ball bearing which mates up with a graphite impeller bearing cap.  The one point is the only point of contact and wear and makes for an extremely long life.  I have yet to see one wear out unless someone accidentally ran one dry.

The other perhaps not so obvious feature that makes a very large impact on the pump is the metal pump housing (Canned Spherical Motor).  There are two benefits to this.   One is the cooling capability and heat transfer that the metal housing provides.  Unlike it’s brother DDC series which uses a plastic housing and resulting heat buildup, the PMP-450 and it’s metal house serves extremely well to watercool the pump.  This does lead to more heat entering the water, however the cooling ability is beneficial to the pump electronics in keeping it cool.  The other benefit to this canned housing is how the metal canning creates a water tight seal around the motor housing.  While the pump is mounted any failure in the o-ring or other possible leak will generally have a very difficult time ever finding it’s way into the electronics of the pump.  I think it’s the above two reasons that make this pump one of the most durable water cooling pumps on the market.  They are water cooled, and have built in leak protection.

Easy assembly

So the pump overall has some real durability enhancing features, it has an RPM sensing wire, and very easy to take apart and clean for maintenance needs.

About the only downside I can think of is the larger size and lack of decoupling pad.  Some folks also have noted that the barbs are slightly over-sized and take a little more force to install tubing on.  I consider oversized barbs a big benefit in general because it generally leads to much lower chance of leaks.  Also decoupling material such as a piece of egg crate works perfectly fine.  I just wouldn’t recommend bolting the metal stand to the case if possible.

12V Test Results

Detail (Retest Done 12-15-12)

Koolance-PMP450-PQdetail12V

Following my usual pressure vs. flow rate testing, I came up with the following family of curves at 12V.  Generally settings 4 and 5 would be good options for average to higher restriction loops and settings 2 and 3 for very low restriction loops.  Setting 1 is really a bit too underpowered to maintain acceptable flow rates, although I would encourage anyone to try.  Note that my setting 5 is actually max and setting 1 is min.  I figure anyone that is operating at 5 likely has the knob turned to the max which is very slightly more than 5, etc.

Setting 1 through 5. Pressure is the solid lines, Watts is the dashed lines.

12V vs 24V

You may have noticed that the pump is perfectly capable of operating at higher voltage up to 24V.  This may lead you to believe there would be a significant performance difference between 12V and 24V.  I tested that below:

Setting 5 12V vs 24V, very very minor benefit with low restriction loops

Unfortunately there is not much benefit to using 24V on the PMP-450 pump.  Up to about 1.5GPM there really was no measurable benefit, on the contrary because it was consuming about 1-2 watts more.  I would not recommend purchasing a controller to operate this pump beyond 12V, it’s just not enough difference to bother with.

Performance PMP-450 vs PMP-400 + Top

While tops don’t help much on the PMP-450 pump because the factory top is already very good, they do help a lot on the PMP-400.  Soo…many have folks choose the PMP-400 for it’s slight performance advantage.  Here is that comparison:

The difference here will not add up to much temperature difference, but the PMP-400 with top is a slightly stronger pump for our more restrictive water cooling loops.

Size

One thing you should also consider with this pump is it’s relative size.  It is generally bigger than the PMP-400 or other DDC pump at least until you put on a top and lift the PMP-400 to provide more cooling.  Then they are comparable.

Size Comparison

On the left is actually the 450S model, but both (450 & 450S) are the same size so I reused the picture.  Without the lifting base, the PMP-400 is a fair amount more compact.  Size is something you’ll want to consider.  Also note that the inlet port and outlet ports are reversed between the two pumps.  The PMP-400 with top accepts the in from the top, where the PMP-450 accepts the in from the side.  Depending on your tubing configuration, you might have a preference one way or the other.

Noise

The pump is extremely quiet, particularly when installed in an acetal aftermarket top.  Check out the noise data in my pump noise round 1 piece where I tested both the stock top and after market top.

Efficiency

Not a huge deal as I think the differences are relatively small, but the PMP-400 when coupled with an aftermarket top will produce slightly more pumping power per watt than the PMP-450, but that is only after the PMP-400 has had the factory top (with an inlet elbow) removed.

Not quite as efficient as a PMP-400 with top

This is pretty minor when you’re talking about 20 watts worth of heat, but something to consider if you’re looking at running something extreme like triple pumps in series.  The PMP-400 with top is a bit more efficient by a few watts depending on the restriction.

Conclusion

Pros
  • Extremely reliable long lasting pump
  • Canned metal housing protects electronics from leak damage
  • Canned metal housing cools the pump motor very well
  • Factory Top performs very well, no inlet elbow
  • Factory Top comes with 1/2″ barbs
  • Koolance brand includes an RPM sensor wire, yes!!
  • Factory speed controller built in (no need for voltage controller to reduce speed)
  • Easy tool less entry
  • Cost – When compared to a PMP-400 plus top
  • Very Quiet
Cons
  • Larger in size
  • Not quite as powerful as a PMP-400 with top
  • Not quite as efficient as a PMP-400 with top
  • No decoupling pad or accessories (bare pump)

So there are some give and takes when compared to the PMP-400 series, but you’ll find the user base very much split out there.  I believe the durability, long life history, and cool operation are all very desirable features many prioritize highly.  I like this pump very much, and particularly like it now that Koolance has provided us with the RPM sensor.  You really can’t go wrong with either the PMP-450 or PMP-400 pumps, I use them both myself and can’t really pick a favorite because I see benefits in both models.  The nice thing about the PMP-450 is that you get a speed controller and a good 1/2″ compatible top factory out of the box.  You also get a pump that runs very cool and has a long history of reliability.  These are all very good qualities and I highly recommend it.

Cheers!
Martin

Welcome to my very first standardized round of pump noise tests in my continued pursuit of silence (The primary reason I water-cool).  This round will be much more controlled with an emphasis on consistency between pump tests.  Anything with the pump noise Round 1 will have the same test conditions.  Pump noise is normally not a concern for folks with higher speed fans or for installs where the pump is allowed to float freely avoiding vibration transfer.  However,  solid mounts and/or when users begin dipping below the 1000 RPM level are conditions where pump noise can become the primary noise annoyance.  This testing effort is looking at a variety of DDC/D5 series pumps in various flavors and tops measure dbA relatively to flow rate on a low restriction loop.

I want to give a huge thanks to my many sponsors.  Tim at Koolance.com, Gabe at swiftech.com, bmaverick, and XSPC.biz have all sponsored in some way.  Without their generosity this test would not have been possible.   Tim from Koolance.com sponsored most of the items in this test including the pump controllers used on voltage regulated pumps.  Thanks!!!

Test Conditions

Test Setup, sorry for the poor phone picture, camera in use.:)

This round will use a low restriction CPU block only type loop that includes the Danger Den MC-TDX, XSPC RS120 radiator, King Instruments Flow meter, 1/2″ tubing, and a custom 3″ ABS reservoir with 5/8″ fittings.  The loop also contains some very low restriction brass globe valves for easier swapping between pumps.  I chose a low restriction loop for this round so I could get a greater number of data points. I may later attempt the same for a more restrictive loop although you could cross correlate with RPM values to PQ pump curves if desired as well.  Some noise is actually generated at the restriction points (blocks) as well, but this will be a good relative test between pumps.

I am also testing in two decoupling scenarios.  The first is a near ideal soft foam free floating type test, the second is direct metal contact.  This gives you sort of a worst/best range of noise.  In my earlier testing I found that thinner foam neoprene would fall somewhere in the middle.  Other options such as rubber washers/grommets would also fall in between and likely a bit more toward the worst case condition.  This best/worst case should give you a sense of possible noise range which is fairly dramatic in most instances.  This will also likely emphasize the importance behind decoupling pumps.

For relative scale, I’m including approximate noise level tests from my Gentle Typhoon fan on the left from my fan/radiator round 6 based testing here.  It was tested at roughly the same distance so I thought it would give some sense of scale to the charts.

Laing DDC-1 + XSPC top

This is the old model DDC-1 pump rated at 10 w and manufactured in 2003.

I think noise level is subjectively higher than average due to a buzz type noise present, but the pump is fairly consistent with very little issue with harmonic spikes even without decoupling.  Fully decoupled at 12V it measures roughly the same noise level as a GT-15 at around 1400RPM.  Noise scales well with voltage and at lower volts is approaching the 940RPM fan mark.  A good performer for it’s age, but not quite as silent as the newer models.

Koolance PMP-400 (DDC3.25) + Koolance COV-RP400 Top

This is the latest PMP-400 pump (18 watt) flavor with a nice thick/heavy acetal constructed top from Koolance.  Being acetal and extra thick, this top will likely provide some improvement to the thin and hard factory top material.

The pump/top combo does very well when completely decoupled.  Even at the extremely strong 12+V mark it’s just a hair more noise than a GT15 at around 1,000 RPM, that’s excellent!  You should however noticed there are two harmonic bumps that may or may not be associated with the simulated test rig.  The metal contact test however was all over the place with harmonics causing increased noise over the decoupled test from 3 dbA to  15 dbA.  This pump & top combo really likes to be decoupled completely if possible, the trick is likely some sort of lift or UN bracket system that will allow cooling and vibration decoupling.

Swiftech MCP-35X

This is the new PWM “Smart Pump” by Swiftech.  One obvious difference is the much larger operating range over voltage control of similar non PWM pumps.

Results are also similarly good when fully decoupled as the Koolance PMP-400 with some slightly higher numbers in some areas by 1-2 dbA.  It does have an extended range and the PWM feature could potentially be scaled dynamically, so those are all details to consider as well.  Overall a good showing that also like to be decoupled for best noise results.  Solid mounting can result in anywhere from 1 to 10 dbA more noise than a really well decoupled installation.  Of course being a DDC series high performance pump, you also may want to consider lifting the pump off the base to provide cooling and decoupling

Koolance PMP-450 (D5 Vario) + COV-RP450 Top

Well how does our larger vario pump model with factory speed controller work, these have generally been popular by the noiseless priority folks as they are factory built with a manual speed controller.  This first test is with the Koolance COV-RP450 top which is somewhat unique in that it includes an aluminum casing for the pump motor.  This serves to mount the pumps, but also to clean up the visual.  In addition, I suspect this help mask motor noises as well…  Let’s take a look:

Decoupled the Koolance PMP-450 with Koolance COV-RP450 top is the top performer, only hitting around 33 dbA at full speed, very good! However, similar to the other pumps when not decoupled, the noise levels climb significantly as RPMs increase creating up to 13dbA more noise than the fully decoupled test.

Koolance PMP-450 (D5 Vario) Sample #2 Stock Top

This is a second sample pump I had hand and initially decided to test it simply because I still had the factory top on it.  My intent was to compare stock top vs aftermarket top, but it turns out I also found some significant sample variance over the first sample.  This pumps had some rather pronounced spikes in noise level in a few places.

Overall this pump sample did good at middle speeds, but had higher than average noise levels at slow and high which I suspect is an impeller that’s slightly out of balance.  Sample variance is obviously a big factor in results so far and is going to make solid conclusions difficult with the low sample quantity being tested.

Koolance PMP-450S (D5 Strong)

The new king of power on the test bench…running with the factory top which it seems to like the best.

The Koolance PMP-450S strong did well, particularly under 14 V with the exception of a blip at 3800 RPM. Very good pump for noise and power.

Laing DDC 3.2

I’ve had this pump for a while, these are the last generation Laing DDC 3.2 series which is being replaced by the DDC 3.25 model.  This one also has the base “Feet” and a solid blue impeller.

This pump did very well and similar to the Koolance DDC 3.25 and only measuring about 1 dbA (less than perceivable noise difference) at full speed.  The thicker Koolance acetal top again seems to help reduce noise levels of the DDC series pumps.  It keeps noise at similar levels to an extremely silent GT fan at 1000RPM which is very good when decoupled.  Loosing the foam decoupler however reveals a similar erratic and harmonic variable results up to 9 dbA higher than the decoupled test.   I’m starting to sound like a broken record here, but decoupling is everything when it comes to pump noise reduction.

Summary Comparison Charts

Noise vs. Low Restriction Loop Flow Rate

First, lets look at the “Best Case” scenario where the pump is completely floating freely on a thick piece of foam.  Note, DDC series pumps should have a stand to allow base heat dissipation.

At the 2.3 GPM mark there are many pumps within about a 2dbA (not perceptible) grouping.  The Koolance PMP-450 with COV-RP450 top having a very slight (and perhaps testing error) edge in the charts.  The Koolance PMP-400 + COV-RP400, Swiftech MCP-35X, and Koolance PMP-450S are all similarly good here as well.  The PMP-450 sample 2 for some reason (suspect sample variance/impeller balance), was slightly higher.  The DDC-1 was also a bit more noisy.

All of the pumps were of good noise level though, and generally when decoupled were producing under the GT-15 noise level at around 1500 RPM.  If you had 10 each 40 dbA fans running in the background that total is 50 dbA, so it doesn’t take a whole bunch of fan noise to quickly mask pump noise “WHEN” the pump is properly decoupled.

So…what happens when you have a worst case mount, direct metal to pump contact….

All bets are off….There is really no consistency other than the general lack of consistency and general rise in noise level.  There are some things to learn here though, the bumps and dips are scattered throughout which means the vibration frequency and speed can be potentially “Tuned” to hit a low point.  If you have a solid mounted or less than desirable pump mount that is causing noise problems, you should seriously consider turning it down/up to see if you can find a low point in the noise curve.  Each case and each installation will likely have a unique harmonic noise/rpm profile/pattern, you just need to find the right pump speed to fall on the dips or low points.

CONCLUSIONS

  • Pump decoupling has HUGE benefits, up to 15 dbA lower noise levels than pumps without decoupling.
  • Pumps without decoupling are erratic in noise with massive peaks and valleys in noise level throughout the RPM range.
  • Thick Acetal pump tops may provide some benefit to reduction in noise levels over thin factory pump tops.
  • Pump sample variance does also affect noise levels, this may be due to how balanced the impeller is. Luck of the draw.
  • PWM pumps such as the Swiftech MCP-35X provide much more control and RPM range than voltage control.  They also provide the ability to dynamically increase decrease pump speed on thermal needs.
  • In general, all of these pumps are extremely silent pumps when decoupled.  Most general users with fans over 1000 RPM would typically have a hard time hearing these pumps at all in a normal fan noise masking environment.  Critical noise folks using ultra slow speed fans should put extra emphasis into pump decoupling methods and undervolting or reducing pump speeds.

Bottom line, if you want an extremely quiet pump, work on completely decoupling it from your case and consider tuning speed to seek the low points along the noise profile.  I would also highly recommend using pumps with PWM or fan controllers with thermal throttling capabilities to dial these pumps up and down with load.  Dynamic pump speed reduction setups allow for both ultra silence AND peak power when needed.

Cheers!

Martin

Laing DDC-1 & DDC-1T

Posted: March 9, 2011 in Pumps
Tags: , , , ,

Yes that’s right, we’re taking a step back in history due to finding a source for new old stock DDC-1 pumps manufactured in 2003. bmaverick from overclock.net and xtremesystems has boxes full of these. Perhaps I’ve been in the water-cooling hobby too long, but I was pretty excited to get my hands on these guys especially since they were in new condition.   bmaverick explained to me that he and his father acquired a whole lot of these (a few hundred) prior to their heading for the scrappers.  What a save!

He went into more details about the history behind the various companies that were involved with the development of these pumps that now shape a big part of what water cooling is today.  That includes Delphi Electronics Cooling, Laing and ITT.  I don’t quite understand all the various historical details, but I do know this DDC-1 pump was one of the first in the extremely popular DDC series we use today in various flavors.

bmaverick was interested in verifying the PQ performance curve and I was happy to do so.  I also figured I will include this for some additional pump noise work later.

OVERVIEW

DDC-1s ready for action!

The black impeller with the larger inlet is the key identifying feature

DDC-1 PCB

DDC-1T

My sample plug pinout

These pumps were destined for OEM use, so you will need to solder/crimp on your own molex connections.    The DDC-1 only has a power/ground,  but the DDC-1T includes four wires.  As the photo shows above, #1 was power, #2 was RPM sensor, and #3 was ground.  I found the RPM reading was high using my crystalfontz by what I believe may be a factor of 6.  RPM would read around 22,000RPM, but when divided by 6, it gives more reasonable 3600-3800 RPM.  This pump also does not have any voltage protection to prevent over volting.  You probably could experiment with 14V or more which would get closer to DDC2 performance levels, but I’m not sure what that would do to life span.  These are a piece of watercooling history for me that I wanted to keep in perfect condition, so I didn’t want to push overclocking the pumps for testing purposes.

TESTING

First I tested both pump models with the factory top and they both performed the same. The two wire model (DDC-1) was easiest to wire as it was fairly intuitive that red = +, black = ground. I just recycled an old fan molex adapter and made a molex out of it. The DDC-1T took a bit more work figuring out the wiring, although the above pictures should make that pretty easy now. Here is how the pumps tested with the factory top:Even in stock top form, the pump is very powerful. An average restriction system will still see just over 1 GPM, and a low restriction system will see around 1.4 GPM. In addition the pump is extremely efficient in power consumption and heat dump. About 9 watts is all it consumes which leave the pump base feeling cooler than the higher speed models.To add to the testing, I ran a quick test on the XSPC top. Here is how it looks with that top installed:XSPC top, DD fatboy barbs, and soldered molex

With the XSPC top, it does have a fair performance boost along with some additional power consumption/heat at higher flows.   With the top in place the pump will have enough power to maintain 1GPM for medium/high restriction loops to low restriction loops.  A low restriction loop could see around 1.75GPM.

The following is a compilation of the above two tests along with my previous DDC3.1 testing.

In stock top trim, the DDC-1 is actually a touch more powerful than the DDC3.1, particularly for higher restrictions. When the XSPC top is installed the tables turn slightly as the DDC3.1 has a slight advatage at lower restriction conditions.   The top is just slightly more tuned for the newer pump model and the smaller impeller it seems.  Both pumps perform very similarly well and most people would not tell a difference thermally.

HEAT

After testing, I did notice some warmth to the base of the pump, but nothing as extreme as the current 18watt models.  The base was warm to the touch, but much cooler than the current DDC3.25 or MCP-35X pump models drawing 18+ watts.  The pump typically draws around 9-10 watts, so it has about half as much heat to dissipate and does a good job at that without any extra cooling.  As always, it never hurts to have some airflow over the base, but these are not nearly as warm as the higher watt DDC2, DDC3.2, DDC3.25, DDC35X pumps.

NOISE

I will be doing more on this later, but I think these are a touch noisier than your current generation DDC3 series but still good for most water-coolers which likely have multiple case fans driving radiators.

OVERALL

The price is amazing for purchasing a piece of history like this and these little pumps are plenty of reliable power for most users.  For those looking to put away some history or for those that simply want a very reliable and strong pump at an amazing price, look no further.

WHERE TO BUY NEW OLD STOCK

Head over to bmaverick’s for sale thread.  He is selling these privately at OCN here for an amazing price…get them while they last!

Or you can contact him via email here:

bmaverick@juno.com

Or one of his sites here:

http://bmaverick.jufreeservers.com/index.html

http://bmaverickddcpumps.wordpress.com/buy-ddc-pumps-here/

http://bmaverick.jufreeservers.com/BUY_PUMPS.html

Prices may change, so check with him prior, but his latest for sale thread had them for $35 shipped to the USA.  That’s about half price of the new generation pumps, so that’s a heck of a deal!