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Loop order doesn't matter? Yea right... - Page 9

post #81 of 96
Hey OP, how about updating the first post so we're not perpetuating the "loop order matters" myth... most people probably aren't going to read through the whole thread to see how it turned out
post #82 of 96
I wont beat the dead horse too much more, but heat is additive.


Rub your hands together for 30 seconds, pretty hot right? Now blow on em for 30 seconds.... probably feels pretty good right?


Now rub your hands again for 30 seconds, and then keep rubbing them for another 30 seconds... I bet you're burning up arent you? Blow on em for a minute, you'll be fine biggrin.gif

Its simple, its common sense to me at least. Others are entitled to make mistakes, thats how we learn.
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post #83 of 96
^What's your point, exactly? "Common sense" can't negate extensive, controlled test results, which repeatedly show less than a degree difference between radiator inlet and outlet, i.e., the hottest and coolest part of the loop, respectively.

The fact is, in terms of temperature, loop order does not matter*.

*With the possible exception of very high heat loads (1.5KW+) and/or very low flow rates.
post #84 of 96
EDIT: Probably should have read entire thread before posting. Glad this got sorted, but OP should really update first post.
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post #85 of 96
The whole "loop order doesn't matter" rule only applies to setups with one radiator and one component being cooled. This should be quite obvious. No offense intended.

If you are cooling more than one component there should be a radiator between them (on both sides). By this I mean pump/res--component1--rad1--component2--rad2--back to res/pump.
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post #86 of 96
Quote:
Originally Posted by AliceInChains View Post

The whole "loop order doesn't matter" rule only applies to setups with one radiator and one component being cooled. This should be quite obvious. No offense intended.
If you are cooling more than one component there should be a radiator between them (on both sides). By this I mean pump/res--component1--rad1--component2--rad2--back to res/pump.

No, it doesn't matter that much.... People keep thinking in non-dynamic terms.... The science and actually testing backs it up. Each molecule of water does not have to absorb that much heat... because there are more. The fluid is flowing and is NOT static.... Water cooling is the active transportation of heat, not conduction along water inside the tubing.
Edited by DuckieHo - 1/16/12 at 8:32pm
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post #87 of 96
Quote:
Originally Posted by DuckieHo View Post

No, it doesn't matter that much.... People keep thinking in non-dynamic terms.... The science and actually testing backs it up. Each molecule of water does not have to absorb that much heat... because there are more. The fluid is flowing and is NOT static.... Water cooling is the active transportation of heat, not conduction along water inside the tubing.

QFT.

Here's some real data from skinnee's testing to illustrate the point, with some notes in red:

TV5tq.png

To reiterate: the hottest point in the loop is at the radiator inlet (or just before it), while the coldest is at the radiator outlet. The difference between the two ranges from a quarter degree to slightly over 1 degree celsius. Not 5 or 10 degrees.

So 550w is what you might expect from a heavily overclocked CPU+GPU in the loop, or a stock CPU+SLI/CF setup, and even there you're only looking at a max 1 degree difference anywhere in the loop. Forget this "water coming out of hot component x is 10C higher" nonsense. It just doesn't work that way. You'd have to have a really high heat load and low flow rates before it starts to become significant. Like well over 1KW and under 0.8GPM - not exactly a realistic scenario.
post #88 of 96
Quote:
Originally Posted by Rpg2 View Post

Loop order doesn't matter as long as it is radiator > cpu > everything else. This is common knowledge.

Common sense, sure?

I run Pump>CPU>GPU>Radiator.


The higher the pressure I can get on the Supreme HF; the lower my temps are. I don't care about the water on the radiator. The slower it enters, the more it cools.


@OP: Thanks for busting a myth. I always believed that my CPU should go first no matter what, and that the most restrictive blocks in the circuit should be cooled the first ones.
   
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post #89 of 96
And just to add to what has been said, when your running prime/IBT, your gpus are IDLE. My dual gpu consumes ~60W at IDLE. So if I cool gpu before cpu when running cpu stress test like prime/intel burn test, the cpu gets 0.15C warmer water at 1.5gpm or 0.2C at 1 gpm, than if I cooled cpu first. You cant see that small difference with just measuring core temps.
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post #90 of 96
TL;DR version: Loop order does not matter.

OP had air bubbles in his CPU waterblock. I was thinking either pump flow issue or some restriction in his waterblock. Turns out OP did not bleed out his loop completely.
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