Quad rad enough to cool OC'ed CPU and SLI gpu's?

billyb0b

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Nov 8, 2009
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Is a quad radiator enough to cool an overclocked i7 975 (say between 4.0-4.4 ghz) and 2 SLI 580's or 2 crossfire 6970's or 6990's in one big loop?

tubing would be at least ID 1/2"
 

aigomorla

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are you after Xtreme System type LC temps?

or you just looking to quiet stuff down and have your gpu's run cooler?
 

aigomorla

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Just looking to keep things quiet and have both gpu's run cooler

then yes it will work.

u wont get the extreme lc temps on the cpu.

But u will get the extreme lc temps on the gpu.

And u will quiet it down a lot depending on the fans u use.

580's maybe pushing it.... ATI is very dooable (not the 6990)

Having 2 580's or 2 6990's is a considerable amount of heat load.
 

billyb0b

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Nov 8, 2009
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then yes it will work.

u wont get the extreme lc temps on the cpu.

But u will get the extreme lc temps on the gpu.

And u will quiet it down a lot depending on the fans u use.

580's maybe pushing it.... ATI is very dooable (not the 6990)

Having 2 580's or 2 6990's is a considerable amount of heat load.


what do u consider extreme temps temps on an OC'ed corei7 and extreme temps on 2 gpu's ?

i currently have the i7 on a corsair h50 with 2 noctua's and it sits around 34-40 idle
 

aigomorla

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simple way to calculate how much radiator you need is take the total power draw of your system @ load.

That means both cpu and GPU.

If you dont know that, then take the TDP on the gpu and double the TDP on the cpu to account for Overclocking.

Add all those numbers up and you get a Value of X.

X / 150 = Y

Y = to the number of 120x1 surface area you need to maintain a decient delta from ambient to watercooling temp.

Then increase Y+1 for slow speed fans... or keep the value Y for medium fans.



So example is u got a 480 = 120x4 =
Y = 4

150x4 = 600W your good for on that 120x4, with medium powered fans.
You would have 150x3 = 450W of cooling potential on Slow powered fans.

Does this make sense?


There is a lot more in the mix.. like flow rate.... but that was why i was asking you, are you after xtreme LC temps on the cpu?

Your cpu will not be as cold as someone who has a dedicated cpu loop.
But your gpu's will probably be almost the same as if u had them on there own loop.
Meaning a net reduction of 1/2 load temps ur currently seeing.
 
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