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How much radiator is needed?

post #1 of 51
Thread Starter 
I am looking to OC and cool dual 7970s and a 3820. Will dual EX240s and push AP-15s be adequate? I am not looking for amazing cooling, but would like to keep everything in reasonable ranges with more silence I am getting tired of the leaf blower fans on the 7970s. I really like the Storm Trooper or Stryker, and my RX360 will not fit in those.

Thoughts?
post #2 of 51
http://www.dangerden.com/Build-Configurations/typical-cooling-setups/CPU-and-2xGPU.html
     
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post #3 of 51
That will work fine.
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post #4 of 51
Thread Starter 
Are there any charts that state how much wattage a radiator should be able to handle and at what deltas? I believe I have come across them in the past, but couldn't find from a quick google. I would just try it and see how it works, but my case choice is completely dependant upon the radiators that are required, so I am hesitant to buy another case I don't need smile.gif
post #5 of 51
Quote:
Originally Posted by yanks8981 View Post

Are there any charts that state how much wattage a radiator should be able to handle and at what deltas? I believe I have come across them in the past, but couldn't find from a quick google. I would just try it and see how it works, but my case choice is completely dependant upon the radiators that are required, so I am hesitant to buy another case I don't need smile.gif


You will not be happy, more like pissed off with only a single 360mm rad or two 240mm rads. I'd get at least a 480mm for the gpus, and 360 for the cpu. Basically, the rads (480+240+120) that I was running my quads off is ideal for dually. Key word, was. Now I run double what I had and am finally happy. Btw, that works out to 280mm per block.
Edited by tsm106 - 7/19/12 at 10:00am
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post #6 of 51
120.2 + 120.2 for a loop with two 7970s and a 3820 probably won't be enough even at stock speeds. It should be fine for normal clocks as long as you keep your water flow and fan speed high, but your deltaT would be really high as well; much more than the target 10 degrees.

You can use some of the results from http://martinsliquidlab.org/2012/04/14/360-radiator-shootout-summary/ as a guideline, but I've not seen any specific data for the EX240. You can expect to get slightly less cooling from a 360 as two 240s.

At stock speed:
210w + 210w + 130w = 550w; + 20w (pump) = 570w

That means without any overclock on the GPUs or CPU, at full load you're looking at almost 600 watts you need to dissipate. At about 2200 RPM, the RS360 dissipates about 280watt and the RX360 about 300watt if you're looking for a deltaT of 10 degrees. That means that even at a very loud 2200 RPM, you would need two 360s instead of two 280s to get decent cooling at stock speed.

One thing to keep in mind is that radiators transfer more heat the higher your delta T becomes, so if you're running instead at a delta T of 20C instead of 10C, your radiators will pull more watts out at the same RPM. Unfortunately, overclocking is dependant on the temperatures of your chips, and a higher delta T means higher chip temps and less overclocking.

[Edit]
The 2200 RPM reference implies that the AP-15 would not be sufficient even at maximum. If you are okay with a high delta T, then you would need more powerful fans unless you get more radiator.
Edited by Electrocutor - 7/19/12 at 10:09am
post #7 of 51
Thread Starter 
Quote:
Originally Posted by Electrocutor View Post

120.2 + 120.2 for a loop with two 7970s and a 3820 probably won't be enough even at stock speeds. It should be fine for normal clocks as long as you keep your water flow and fan speed high, but your deltaT would be really high as well; much more than the target 10 degrees.
You can use some of the results from http://martinsliquidlab.org/2012/04/14/360-radiator-shootout-summary/ as a guideline, but I've not seen any specific data for the EX240. You can expect to get slightly less cooling from a 360 as two 240s.
At stock speed:
210w + 210w + 130w = 550w; + 20w (pump) = 570w
That means without any overclock on the GPUs or CPU, at full load you're looking at almost 600 watts you need to dissipate. At about 2200 RPM, the RS360 dissipates about 280watt and the RX360 about 300watt if you're looking for a deltaT of 10 degrees. That means that even at a very loud 2200 RPM, you would need two 360s instead of two 280s to get decent cooling at stock speed.
One thing to keep in mind is that radiators transfer more heat the higher your delta T becomes, so if you're running instead at a delta T of 20C instead of 10C, your radiators will pull more watts out at the same RPM. Unfortunately, overclocking is dependant on the temperatures of your chips, and a higher delta T means higher chip temps and less overclocking.
[Edit]
The 2200 RPM reference implies that the AP-15 would not be sufficient even at maximum. If you are okay with a high delta T, then you would need more powerful fans unless you get more radiator.

Let me be sure that I understand this graph. Lets say my ambient is 24C. If my GPU put off 201W with 1400 RPM fans on an RX360, my GPU would get up to 34C at load? Right now with fans at reasonable (and even reasonable is loud), these things are hitting 65C+. I'm looking at water more for the noise than the temps, but also want good temps. I don't need my CPU and GPUs all running at 10C delta at load with dual 480s.
post #8 of 51
I would highly recommend looking at a different case, as neither of the two you mentioned seem to be good for water cooling. I would suggest the NZXT Switch 810, Xigmatek Elysium (lower build quality but more rad room than the Switch), a Caselabs M8 (expensive but the CL cases are absolutely the best possible), or similar.

Going by that, I would recommend getting a 420mm radiator and a 240mm radiator. In the Switch, you can have the 420 up top (EX420 w push/pull fans), 240 in the bottom (EX240 Multiport if you want dual-pass options, or Alphacool NeXXos UT60 240), and hang the RX360 off the back. That is what I would do, and with such a setup you're looking at a DeltaT of around 5C give or take, which means massive overclocking headroom and very cool components.

Always get more rad space than you think you need, and never try to squeeze by with the minimum.
   
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post #9 of 51
Thread Starter 
Quote:
Originally Posted by nleksan View Post

I would highly recommend looking at a different case, as neither of the two you mentioned seem to be good for water cooling. I would suggest the NZXT Switch 810, Xigmatek Elysium (lower build quality but more rad room than the Switch), a Caselabs M8 (expensive but the CL cases are absolutely the best possible), or similar.
Going by that, I would recommend getting a 420mm radiator and a 240mm radiator. In the Switch, you can have the 420 up top (EX420 w push/pull fans), 240 in the bottom (EX240 Multiport if you want dual-pass options, or Alphacool NeXXos UT60 240), and hang the RX360 off the back. That is what I would do, and with such a setup you're looking at a DeltaT of around 5C give or take, which means massive overclocking headroom and very cool components.
Always get more rad space than you think you need, and never try to squeeze by with the minimum.

I have the switch, and I'm not a big fan. It feels rather cheap to me, and the door never seems to fit on correctly. Is my previous post correct? My main goal isnt to get my temps as close to ambient as possible. I am more interested in having above average temps, but in a quite build. If my GPUs ran in the 40s, thats fine. I dont need them running at 30.
post #10 of 51
Then you could stick with the RX360 and add a 240, but you will be running high speed fans regardless unless you have the equivalent of maybe a 480 + 360 when it comes to low-FPI rads at low fan speeds cooling a dual-7970 + SBE CPU. And the proposed loop I mentioned above would likely have your GPU's in the 40's under load, not 30's.

You just are not going to get quiet + cool with 2 240 rads on your setup. Really, you should have a 240 for each component when they are high-powered ones such as yours.
I think that you would be looking at running 8x 120mm fans @ 2000rpm all the time (push-pull) just to keep temps decent, and I don't know if even some 5400rpm Delta fans would be able to counter the heat soak...
   
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