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How much more radiator do I need?

post #1 of 14
Thread Starter 
I have a 2500K at 4.4Ghz and 1.32v. It idles at about 35C and under load doesn't go over 54C, delta of 19C. It's cooled with an RS240 rad and I have two scythe slipstream fans in a push configuration. They're pushing ambient air through the rad that's ~22C.

I'd like to my GTX 670 to the loop however I'm doubtful my current configuration could handle it. Here is my calcuation:

CPU wattage at full load: 100w
GTX 670 wattage at full load: 170w

Current delta per watt: 19/100 = .19

Delta with the 670 in the loop: (100+170)*0.19 = 51.3

System temp with CPU and GPU at full load 35+51.3 = 86.3

Please advise if any of my calculations are incorrect. Assuming they are correct, what I don't know is how much heat say an additional 120mm radiator can dissipate, and whether it would be enough to get the temps down to something reasonable.

By the way, those slipstreams are on a fan controller and I keep it on the lowest setting. It doesn't seem to make more than about a 1C difference when I turn them up all the way. Would this change with more components in the loop/more heat being dissipated?
Edited by senslessenigma - 11/29/12 at 11:31pm
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post #2 of 14
Depending on fans used, ambient temps, etc. either a second rs240 or a thicker (or higher fpi) 120mm radiator should work fine for that setup.
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post #3 of 14
Thread Starter 
Is there a 120mm rad you would recommend over any other? XSPC makes one dont they?
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post #4 of 14
Yes, I would recommend either an EX120 with higher speed fans, or an RX120 if you're wanting to use quieter fans. (both XSPC)

If you're willing to stray away from XSPC, then Alphacool NexXxoS radiators are known to be some of the best.
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post #5 of 14
MOAR RADS. Get it between the CPU and GPU if you can.
post #6 of 14
I'd definitely add at least another 240. I've always read that the general rule of thumb is 240mm of rad space per block. Putting the block between the cpu and gpu won't make much of a difference since the water temp will eventually equalize over time. I have a temp sensor on the input of my 240 rad(end of the loop) and the output of the 480 rad directly after that(beginning of loop) and there is really only 1-2C difference.
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post #7 of 14
in your case (hahahaha pun) I think you should go with an EX120 on the back fan and/or if you can fit a RS240 on the hard drive cages that might not be bad either. You might be able to get away with a bigger rad there if you have one of those short 670s.

You could also mount a rad off of the back.
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post #8 of 14
- double please delete-
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post #9 of 14
Quote:
Originally Posted by morencyam View Post

I'd definitely add at least another 240. I've always read that the general rule of thumb is 240mm of rad space per block. Putting the block between the cpu and gpu won't make much of a difference since the water temp will eventually equalize over time. I have a temp sensor on the input of my 240 rad(end of the loop) and the output of the 480 rad directly after that(beginning of loop) and there is really only 1-2C difference.
I typically hear / recommend 120mm of radiator space per block, plus an extra 120mm of radiator space as a minimum.
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post #10 of 14
360mm rad about 12 fins sounds about right
    
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