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radiator size

post #1 of 17
Thread Starter 
Being new to watercooling, and also being unsure of any component to be used in my next build, how does one determine what size radiator(s) to use?

I have seen some specific recommendations, but is there a reference somewhere?
I have searched the forums already, but I may have missed it.

If someone can point me in the right direction, I would appreciate it.


Thanks,

Paul
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post #2 of 17
I can't point you to a site where you plug in what will be in your loop and it pops out a rad size. But, if you list what will be in your loop, I can pop out a rad size recommendation.
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post #3 of 17
To determine the radiator size, you must first determine what you want to cool and how much space do you have.

To choose which radiator you would like, you must determine how loud you want the system to be.
Edited by Pencuri - 2/23/11 at 1:36pm
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post #4 of 17
For starter, if you want CPu only loop you would be looking at 240mm radiator or could go single 120. Then there is a radiator that's twice the width.

for CPU and single GPU fat 240 or 360mm rad should be sufficient
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post #5 of 17
1) Go the user control panel
2) click on "edit system"
3) fill out your specs
4) tell us exactly what you need and are planning for the future

post #6 of 17
Thread Starter 
So it's safe to assume that I will have to rely on the experiences of others?
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post #7 of 17
Quote:
Originally Posted by 80486DX View Post
So it's safe to assume that I will have to rely on the experiences of others?
Yes, this is generally how we do things around here. However, there are some equations that you can look at to see how much heat your radiator can cool vs how much heat your system will generate. Admittedly, I do not know these equations. Not to mention they talk in terms of everything operating exactly how it is meant to and we all know that rarely happens.

Just let us know what you want to do with your loop and we won't steer you wrong.
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post #8 of 17
There is a more scientific way of calculating how large of a radiator you need, but it's somewhat complicated. Basically you first have to add up the total wattage of everything in your computer that you want to cool. Then you find test data from one of the reputable testing sites (IE Martin, Skinnee Labs, DeXgo/HESMelaugh) and calculate your water-air delta by multiplying the C/W of your radiator at your fan speed. You want to aim to have around a 7C water-air delta. Lower deltas = lower temperatures but it starts getting really costly to go below a 5C water-air delta.
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post #9 of 17
Thread Starter 
o.k.,

Here's a hypothetical system:

Cooler Master CM 690 II basic case
AMD X6 1090T CPU
AMD HD6870 graphics card
XSPC RX240 radiator with low speed fans

RX240 mounted in the bottom of the case
I don't have plans to overclock

I know i can add a thinner rad in the top of the case, but doing that would increase the noise due to the higher RPM fans

Is this enough radiator?
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post #10 of 17
Yes, more than enough. You could even use a slim 240 with slow speed fans if you don't want to overclock. If you want a silent system I would get this:

XSPC RS240 Kit
GentleTyphoon AP-11 1150 RPM Fans x2
Primoflex tubing 7/16" ID
Bitspower 1/2" Barb x2
EK 6870 Nickel/Acetal Waterblock

Total - ~300 shipped
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Labor of Love
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2600k @ 5.0 GHz/1.42v ASUS P8P67 Pro MSI GTX 670 OC 20 GB/1600/7-7-7-24 
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120GB Vertex SSD Western Digital 1TB None! Ubuntu 12.04/Win8/OSX 10.8.2 
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