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Is a single 120mm Rad enough for CPU + GPU loop?

post #1 of 10
4/26/12 at 10:41pm
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I'm planning an ITX build involving a 2500k and a 7970 in the near future. Just wondering if a single high end 120mm rad (RX120 or EK XT perhaps) would be enough for the heat load (assuming light overclocks on both). What about a rad sandwhich/stack if the previous does not suffice?
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post #2 of 10
4/26/12 at 10:45pm
I'd say no. I think you will need atleast one 360 for that. I got one 360 and one 120 on my loop. 2500k@ 4.8ghz and stock GTX 680.. Tho I overclock sometimes when gaming and it holds the temps under 50C. I would say atleast 240 for each component for good temps especially if you will run the overclock hardware 24/7.
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post #3 of 10
4/26/12 at 10:47pm

Ideally you'd want at least a 240mm rad for it to be worth it over air and in your case it doesn't look like there's enough room for everything

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post #4 of 10
4/26/12 at 10:51pm
I use 1 480 rad and a 120 rad and I still don't like the temps on my gpu and cpu. 2700k and 4890. I get 30c dile on the 2700k and 28c on the 4890 heating up to 45c (cpu) and 40c (gpu). You might want rad/part/rad/part
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post #5 of 10
4/26/12 at 10:52pm
A radiator sandwich isn't all that great in performance. The second radiator is getting warmer air, making it noticeably less effective than if you were running them in different locations. You're going to want at least 2x120 radiator for that, and if you're going to want low-rpm fans 3x120 would be much better.
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post #6 of 10
4/26/12 at 10:57pm
I'd say its probably not worth it for you if you are still using the same case. Just an all in one for the cpu and leave the gpu to air cool. Not worth spending all the money for 2x120mms because your case is limited in space.
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post #7 of 10
4/26/12 at 11:15pm
It's going to be one baked radiator, looks like both of them are low FPI also, won't work.. if you are using a high FPI like the HWL GTX 120 with a 2200+ RPM fan, it may work but then again, the surface area is so little, not sure if it's even worth it when compared to air.. I wouldn't overclock on a 120mm rad + GPU + CPU loop.


Is there no way to squeeze in a 240?
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post #8 of 10
4/26/12 at 11:27pm
I concur with the six people above me to reject the idea of using a single 120 rad for both the CPU and the graphics card.

Here is my analysis:
2500K @ stock 3.3GHz has TDP of 95W.
http://ark.intel.com/products/52210

HD7970 @ stock clock consumes about 195W.
http://www.guru3d.com/article/amd-radeon-hd-7970-review/8
http://www.techpowerup.com/reviews/AMD/HD_7970/26.html

Total combined wattage to be dissipated ~= 95 + 195 = 290W

Using Skinnee's chart for RX120 and assuming the watercooling system is an average performance system (ie having 10C Delta), the fan will need to spin at around 2700rpm.
554
(chart source: http://skinneelabs.com/xspc-rx120-v1/4/)

This will be quite noisy, IMHO. If you add another fan to do push-pull, it will probably bring about 20% more performance. But I think the noise level will remain at a relatively high level. Also note that neither the CPU nor the graphics card is overclocked. But, of course, both are unlikely to be fully stressed simultaneously in a real world situation unless you purposefully put both under a loading test.

So, as the general rule of thumb says, better allow a 120 rad cooling capacity (at the minimum) for each component.

Stacking/sandwiching two rads usually is not very effective. See the reference below for some numbers.
I would much prefer using a 240 rad or putting two 120 rads at different locations of your case. For your TJ08E, it is going to need some creativity and/or modding.

Reference for stacking/sandwiching rads:
http://www.xtremesystems.org/forums/showthread.php?220874-More-Radiator-Sandwich-testing
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post #9 of 10
4/26/12 at 11:48pm
Somewhere another forum I've read the post of the single 120 THICK radiator performing like a triple rads & temperature killer.
Edited by GAMERIG - 4/26/12 at 11:51pm
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post #10 of 10
5/2/12 at 3:24pm
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Thanks for the replies, It seems this isn't viable at this point without getting a larger case or using the mATX form factor. I do have an older PC-V354 lying around and the following has given me some ideas...

306087d1295646648-wakue-bilderthread-img_2924.jpg
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