Swiftech MCP 655-PWM-DRIVE Pump Review

Posted: December 25, 2012 in Pumps
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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.


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.


Manufacturer Description & Specifications


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.

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  1. […] io le pompe le uso per due circuiti separati, se tu hai tutto in serie una sola pompa dovrebbe essere sufficiente.. il wb koolance non e' restrittivo, cosi come gli ultimi ek per vga (mentre quelli di aquacomputer ad esempio lo sono). il controllo della D5 con il Lamptron dovrebbe essere possibile, ma leggevo che qualche problema c'e' stato ( leggi qui per approfondire Introducing the LAMPTRON CW611 water cooling assisted fan controller! – Page 18 ). la phobya non la conosco, qui c'e' una recensione (in tedesco, ma i grafici sono chiari) di 15 pompe 15 Wasserpumpen im Test (11-2010)*-*AwardFabrik :: Testberichte :: Overclocking questa invece e' la D5 con PWM http://martinsliquidlab.org/2012/12/…e-pump-review/ […]

  2. PBXfailuer says:

    I’m using the Swiftech mcp 655 pwm on a swifttech claer pumptop. I have the out pluged, with the (IN) connected to my tubing. At the end of my loop the coolent is put back into the res from the top. My question is, when trying to bleed my loop for the first time, nothing is being pulled through. I ca hear the pump and it doesnt sound like it’s being ran dry. I can see a small swirl but nothing being sucked down to fill the loop. My res is only half full because I can out of coolent. Am i sucking too much air? please help.

    • Martinm210 says:

      Not sure I follow what you mean by the out being plugged or which particular top you are using. The pump inlet needs to be fed by the reservoir and low enough that when filling the reservoir that is floods the pump (priming). The outlet needs to be connected as well but order of which blocks or rad doesn’t matter much beyond the res before and above pump.