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CPU only--240 vs. 360

post #1 of 11
Thread Starter 
For a CPU only loop, is it beneficial to have a 360 rad over a 240 rad? Aside from GPU upgradeability.
Is there a noticeable difference in temperatures?
post #2 of 11
Most likely not, a good 240 rad will have minimal difference when compared to a 360 rad, for a cpu loop.
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post #3 of 11
A single CPU won't make enough heat to even warm up a 360 rad. I run my cpu only loop with a 240 rad, and it only gets warm when the machine is really working.

Remember, a radiator is most efficient at dumping heat when it's actually well above the ambient temperature. A vast radiator on a CPU only loop is pointless, as once the water gets close to ambient the radiator becomes insanely inefficient.
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post #4 of 11
Well you don't really need to water cool in the first place anyway. Air does a fine enough job. I started playing with water, basically because I felt like tinkering with cooling systems.

More radiator space IS definitely advantageous, though. You could, for instance, run your triple fans at lower RPMs to get the same delta temperatures that your dual radiator would get you. Quieter is nicer.
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by allikat View Post
A vast radiator on a CPU only loop is pointless, as once the water gets close to ambient the radiator becomes insanely inefficient.
Could you elaborate?

Doesn't more rad "space" give it more potential to be cooled?
post #6 of 11
Quote:
Originally Posted by kiwiasian View Post
Could you elaborate?

Doesn't more rad "space" give it more potential to be cooled?
technically yes, but you wouldn't be using all of that potential. a cpu might generate around 200w of heat at the absolute most, when overclocked and working at 100% (which isn't often). the average 240 rad can dissipate at least that much, and of course so can a 360. this metaphor makes almost no sense, but think of it like a car engine - the 240 rad can go 50 mph, the 360 can go 80mph, but the speed limit is 30 so it really doesn't make a difference
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post #7 of 11
Quote:
Originally Posted by kiwiasian View Post
Could you elaborate?

Doesn't more rad "space" give it more potential to be cooled?
Short answer is yes. The reference made earlier in the thread is that the size of the rad does not provide a linear improvement in cooling. Sure a 480 rad will cool a cpu loop better than a 240, but not twice as well.
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post #8 of 11
basically, how effectively/quickly a rad can cool heat well below its capacity plateaus, no matter the size. thermodynamics or something
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post #9 of 11
Quote:
Originally Posted by tommy1993 View Post
basically, how effectively/quickly a rad can cool heat well below its capacity plateaus, no matter the size. thermodynamics or something
Exactly. And in every case, the first part of your rad does most of the work, since it's the hottest part, it disperses the most heat.
Think of it this way, each section of rad will lower the coolant a fixed percentage towards ambient. And since you start getting diminishing returns very quickly, each section after the first will drop temps by less and less actual absolute degrees c.
Sure you can have a 20 foot long rad, but it will only cool a fraction of a degree better than a 10 foot long one.

Going big on your rad is only really worth it if you plan on adding other blocks to the loop. A 240 is plenty for a CPU only loop, especially if you add some good fans. With stuff going on in 3 displays, my 240 rad is only barely above ambient, on a 4Ghz quad core PhenomII which is sucking down 1.5v. You have an Intel i7, which is a more efficient CPU and actually makes less heat in most cases.
Edited by allikat - 1/17/11 at 5:01pm
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post #10 of 11
Thread Starter 
so if i am understanding correctly, i will never use the full potential of a 360 rad, even though the potential is there.
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