EK-Coolstream RAD XT (360)

Posted: April 16, 2012 in Radiators
Tags: , , , , ,

This is #11 in my series of triple radiators the EK-Coolstream RAD XT (360).  This is one of two of EK’s 120mm radiator line up which includes the more value friendly XT and premium XTX.  The two differ in thickness, materials, and features where the XT is constructed of brass tubes and 46mm thickness and the XTX is constructed of copper tubes and 64mm in thickness.   The XTX also includes more ports and a air bleed where the XT is more value oriented with the standard 2 ports.  Here we are looking at the more value oriented, slimmer 46mm, brass tube XT model from EK.

A special thanks to EK for providing the review sample:






EK-CoolStream-RAD XT 120mm series

Finally EK is ready to offer you radiators designed for hardest enthusiasts. Radiator is optimized for maximum heat dispatching even at lowest fan speeds. Choosing EK-CoolStream RAD XT will give your watercooling system a boost you needed to cool your hot hardware.

Quality at EK level and an optimal price-performance ratio make these EK-CoolStream RAD XT radiators unique. The new radiators feature, besides their great design and high build quality, great cooling performance.
The copper fins are specially designed for Ultra-silent fans (with low Airflow). The parallel coolant channels reduce flow resistance to a minimum. On both sides of the radiator the M3 threads are integrated to allow fan installation on both sides and radiator mounting.

The radiator has integrated G1/4″ threads, allowing installation of virtually all common fittings.

Please note: Over-tightening of the screws may damage the radiator. Always take care that the screws do not damage the radiator. Damages of the product because of improper use are not covered by the warranty!

Technical details:
– Copper fins
– Brass chambers
Dimensions (LxWxH): 398x123x47mm
Connection threads: G1/4″
Weight: Approx. 1350g
Fan installation: 12 x M3 threads on both sides each (for 3x120mm fan each)
Pressure tested: 1bar

1x EK-CoolStream RAD XT (360) radiator
12x M3 x 30mm DIN965 screws
12x M3 x 35mm DIN965 screws

Important: The included screws may be too long for some applications. Always be sure to screw them in only so far that the radiator is not damaged.

Dimensional Drawing:


Installation Manual:


Of particular interest is the 47mm thickness being another one of the “In-between 30 and 60mm” thickness while retaining a more narrow 123mm width.  The tubes are your more value oriented brass material and the screws are smaller but common M3.

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  1. Zareth DeTullio says:

    I’d really like to see some comparisons on thinner radiators between push and push/pull at slow fan speeds.
    The idea being that 6 fans at 800 rpm are often a lot quieter than 3 fans at 1200 rpm and you may be able to get good slow fan speed performance like that.

  2. Badelhas says:

    Hello Martin and congrats on the fine work you do here, thanks a lot.
    I was wondering if it would be possible to test the Asetek 760gc and 740gf clc kits? They look interesting but no one did a review on this yet…


    • Martinm210 says:

      If you have a lead on a parts sponsor let me know. Not having much luck on he kits sponsoring.

      • Badelhas says:

        How about if you say to them that there isn’t a single site or proper reviewer who reviewed their 760gc cpu+gpu watercooling kit? Maybe they will be interested in that. There are some users who done it and the results are surprisingly good for a mere 120mm radiator. I ordered a 760GC and a 740GF to cool my 2500k OCed to 4.3Ghz and my two Inno3D gtx570 Hawk in SLI. I will see if my temps and noise goes down but it will be a rather subjective opinion, if you could do it it would be great so that everyone knows if it’s worth it or not. 😉

  3. Thomas says:

    I’m looking at this and the XTX for a possible watercooling loop when I step up from the Corsair Hydro H100i to a full custom setup. As I’m going to mount it in the roof of a Corsair Obsidian 750D and possibly do push/pull the XTX might be a bit on the big side. Do you think this one would be enough for a moderately to low overclocked system with just two blocks (GTX 770 gfx card and 4670 cpu). Planning to go for silent run so low rpm fans. Also, am I right in thinking that with the low rpm fan intended design that static pressure isn’t as important as with normal rads?

    • Martinm210 says:

      Sure. I would let static pressure sway you fan choice too much. While there is some difference between fans, I have found that they all produce about the same air flow through a radiator with about a 400rpm difference. Also static pressure is actually a theoretical point when air flow is zero and means less than a fans PQ curve or pressure capabilities at a point along that curve. A fan like the gentle typhoon with lower static pressure but great curve can produce more air on a radiator that some fans with higher static pressure like Cougar fans, etc.

      Basically RPM speed is really the better reliable indicator of air flow performance and the faster the more air. Buy Gentle typhoon AP-15s if you want the lowest noise per speed at 1800, it actually produces more air than most 2000rpm fans at about 10dbA less noise.

      If you want to run <1000 rpm fans, just about any will do, good cheap yate loons or artic cooling F12s are good cheap options that perform well at slow speeds.

      • Thomas says:

        Thank you! quick and extensive answer, you’re a real help to a wc noob 🙂 The fans I’m actually considdering are the Be-Quiet SilentWings 2 or Shadowwings (at least for case fans) all PWM. Any thoughts on the radiator choise as mentioned above? Also need to find a reread your flow/pressure article again for the pump decision (EK DCP 2.2 or 4.0).

        • Martinm210 says:

          EK rads are both good performers. Rad performance is also very close. The all copper Alphacool equivalents pulled very slightly better numbers when measuring very small numbers but not so much that average use will show anything obvious. I think best to worst rad is no more than about a 17% difference so very close regardless of thickness or brand.

          BeQuiets are ok, but only tested about average. Nice looking and lots of accessories, seems like good quality, but not as good a performer as GTs. Haven’t tested the other one, but would guess average performance as well.