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Does it matter where you put the most restrictive part in your loop?

post #1 of 10
Thread Starter 
While waiting for my board to return magically as b3 stepping I've been testing my loop and the most restrictive part in all of it is the cpu block which is pretty much the only thing that really changes my flow rate.

So if the cpu block is the most restrictive, should I have it as the first part in the loop (ie pump -> cpu block) or the last thing ( loop -> cpu block -> pump)?

Does it even matter?
    
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post #2 of 10
Quote:
Originally Posted by BallaTheFeared View Post
Does it even matter?
Not really, the flow will be the same at all points in the loop, regardless of the order they are in.
The total of all of the pressure drops will be the same, regardless of what order they are in.
Just make sure your reservoir is just before the pump, and for best CPU cooling, have the CPU water block as the first load in the loop.
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post #3 of 10
Thread Starter 
Not sure how I'm going to set it up, I have 2 rads and 3 blocks
    
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post #4 of 10
single D5 is enough to push through all of the above
Edited by coolhandluke41 - 4/24/11 at 3:32pm
    
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post #5 of 10
Quote:
Originally Posted by Caleal View Post
Not really, the flow will be the same at all points in the loop, regardless of the order they are in.
The total of all of the pressure drops will be the same, regardless of what order they are in.
Just make sure your reservoir is just before the pump, and for best CPU cooling, have the CPU water block as the first load in the loop.
Just to comment on that last part. Throughout your entire loop the water temperature will not differ by more than .5C which is very insignificant. So just do your loop in whatever order makes it easiest to set up.
post #6 of 10
Quote:
Originally Posted by Kinru View Post
Just to comment on that last part. Throughout your entire loop the water temperature will not differ by more than .5C which is very insignificant. So just do your loop in whatever order makes it easiest to set up.
I'd rather have that .5ºC cooler water going to the CPU block first, but yeah, it isn't worth doing some crazy piping job to achieve.
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post #7 of 10
Thread Starter 
Well to be honest my main concern is the gpus, the cpu runs cool as it is and temps aren't a limiting factor in my overclock (reason and voltage are).

The cards however don't like to be warm, in order to run them over 930 core they need to stay below 45C load. Here is what I was thinking...

Res/Pump -> 240 Rad -> gpu1 -> cpu -> 360 rad -> gpu2 -> res/pump
    
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post #8 of 10
Wow, we have a lot of good people here.

Minor points:

1. For "best" CPU cooling have the CPU block immediately after all the rads, so long as there is no crazy piping to do so The difference will be minimal however because:

2. It takes ~250W to raise water at 1GPM by 1°C. So the water will vary by a very small amount, as Kinru said.
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post #9 of 10
You must have gotten some good cards!
I can't get my stupid Asus ENGTX470 stable above 750 mhz core, at least not for folding.
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post #10 of 10
Thread Starter 
Yeah my first card did 900 core on cold air, so I put it under water and it did 930 core pretty easy with 1125v.

I got a second one used off here and nothing was said about overclocking or warranty, but it came with a backplate and a lifetime warranty. Only problem was even with shin etsu on the stock cooler (vram/vrms/core) it still got pretty hot, and it was dumping all that heat and noise right next to me since I have no case.

It did 875 core on 20C ambient air though, so I figured it was worthy of water. Here are my temps after about an hour of BFBC2 at 850 core. One is on air, the other is on water (lol bet you can't guess which).



Temps are a bit high due to one broken fan, but I've replaced them all with new high speed 38mm fans hoping for better results
Edited by BallaTheFeared - 4/24/11 at 9:11pm
    
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