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1st WC set-up Gpu-Cpu vs Cpu-Gpu - Page 2

post #11 of 19
Quote:
Originally Posted by jca73 View Post
Thanks for the replies guys.

In the case of some of I7 user i see why you would go cpu 1st,but in my case my x3 740 taps out 55c on load on a bad heat wave days and 5770 78-82 c on Witcher 2.I just trying to compare configuration ,if i go gpu loop 1st it just seem to be more shorter tubing streamline set up.
First off, as was mentioned, loop order really does not matter, so long as your res is before your pump. The temp will be 1-3c difference from outlet of radiator to inlet/return at worst.

Second, jca, your temps are not the same as Intel processor temps. AMD processors max out at 62c, Intel processors at ~100c, and are measured in different ways and "safe/comfortable levels" with AMD processors are much lower than those of Intel.

Thirdly, if you check out my build link in my signature, you'll see my loop, which consists of two overclocked 6950s in the loop before my CPU. With that, on 24/7 folding, I see no higher than 63c on my processor, well within the "comfort zone" of Intel CPUs (room temp at about 27-31c).

I would go for the more streamlined setup over loop order (barring the pump/res business). You don't benefit from more hose, since you've got a reservoir, and the extra length can only complicate things. Shorter and simpler are better.

While common sense dictates that you would want to have each part as cool as possible by having a radiator between them or what have you, the reality is that it really doesn't make much of a difference (negligible/rounding error/standard deviation difference). It's a hard thought for people to absorb, as you can see.
post #12 of 19
I agree that it makes little difference rather GPU first or CPU first, I run mine CPU first because the rad is at the top of my case so first stop is the CPU block

I will mention that one should try to run their loop as such res. -> pump -> rad.

the pump does add heat to the water so it is best to run it through the rad after it leaves the pump
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post #13 of 19
I have my gpu first then my other gpu then my cpu all in one loop, I opted for the using the least amount of tubing and my temps are awesome, cpu peaks at 70c doing 12hours prime blend and both my gpu's never go above 40c in gaming. Do which ever one uses less tubing, that will benefit you more, than using more tubing just to get the cpu first, which is a difference that won't notice.

Hope that helps
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post #14 of 19
Quote:
Originally Posted by slickwilly View Post
I agree that it makes little difference rather GPU first or CPU first, I run mine CPU first because the rad is at the top of my case so first stop is the CPU block

the pump does add heat to the water so it is best to run it through the rad after it leaves the pump
Ahh! That's the same logic that everyone else is arguing though, that we're trying to get people to realize doesn't matter! The pump adds like 10w of heat, so if it did matter (which it doesn't), it would be insignificant relative to the CPU and GPU order, which again is irrelevant

Loop order does not matter. All that matters is that you've got good water flow and sufficient radiator surface area for your components.
post #15 of 19
Thermal.
Equilibrium.

Loop order doesn't matter, works out to be the same anyways. Seems Dr.GumbyM.D. has you covered, I'd rep him if you haven't.
post #16 of 19
Sorry OP but i have a little question to ask, it is loop order releated and the info may be of benefit to you also

Quick question guys, my loop order is Res/Pump Combo>Rad>CPU>Res/Pump Combo

I was wondering if i'd be better off going Res/Pump Combo>CPU>RAD>Res/Pump Combo?

Only reason i've thought of this is don't rads suffer from some pressure drop? So would the water be flowing a little slower across my CPU when it comes from the rad?

Im very new at this so im still trying to learn

Thanks
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post #17 of 19
All depends on routing. Whatever is closer to the pump gets routed first for me. When i redo my line i'll direct it to the CPU first then the GPU
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post #18 of 19
Quote:
Originally Posted by Matt26LFC View Post
Only reason i've thought of this is don't rads suffer from some pressure drop? So would the water be flowing a little slower across my CPU when it comes from the rad?
Radiators actually have very low restriction compared to other components, like CPU blocks for example.

Remember; your loop flow rate will be the same throughout the loop. The same amount of water is going into the start of the loop as is coming out (unless you have a leak!), so it does not matter what order your components are in, they will all get the same flow rate through them (ignoring any parallel setups).



Please note guys, the water in the loop is not the same at every point in the loop. Yes, you will achieve thermal equilibrium, but this does not mean identical temps everywhere, it just means that the temperature at each point will remain stable at it's current value.

If the temperature of the water at every point was the same then we would not be able to move any heat anywhere. The important point though is that the temperatures do not vary by much. As I said before, ~250W per °C at 1GPM, so even with a large system dumping 1000W into the water the temperatures will only vary by 4°C throughout the loop.


Tl:dr
1. Flow rate is the same throughout the loop.
2. Water temperatures are at different values throughout the loop even at equilibrium
3. Water temperatures do not vary by much.
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post #19 of 19
Thread Starter 
Quote:
Originally Posted by Dr.GumbyM.D. View Post
First off, as was mentioned, loop order really does not matter, so long as your res is before your pump. The temp will be 1-3c difference from outlet of radiator to inlet/return at worst.

Second, jca, your temps are not the same as Intel processor temps. AMD processors max out at 62c, Intel processors at ~100c, and are measured in different ways and "safe/comfortable levels" with AMD processors are much lower than those of Intel.

Thirdly, if you check out my build link in my signature, you'll see my loop, which consists of two overclocked 6950s in the loop before my CPU. With that, on 24/7 folding, I see no higher than 63c on my processor, well within the "comfort zone" of Intel CPUs (room temp at about 27-31c).

I would go for the more streamlined setup over loop order (barring the pump/res business). You don't benefit from more hose, since you've got a reservoir, and the extra length can only complicate things. Shorter and simpler are better.

While common sense dictates that you would want to have each part as cool as possible by having a radiator between them or what have you, the reality is that it really doesn't make much of a difference (negligible/rounding error/standard deviation difference). It's a hard thought for people to absorb, as you can see.
Thanks for the good info.On the subject on your build log.Do you leave that sponge in your case at all time?
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