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Want to combine 2 loops into 1 - Advice needed

post #1 of 14
Thread Starter 
Ok, so I have been running the same setup for almost a year now (click link in my sig to see worklog with pics and such). Currently I have 2 loops, using XSPC 750 res/pump combos.

In the current setup, I have 1 loop for the GPUs (2x5870 CF, 2nd card is not in worklog) running on a BI 120GTX rad, and in my 2nd loop, I have just the CPU and chipset running on a 360 BI GTX

Everything has been working great, and I get really good temps, even on the 5870s and little 120mm rad, which will full load at about 50C.

What I want to do now is combine both loops into one big loop, and I am trying to figure out how to accomplish this using the components I have now.

If I was running normal pumps with a single res, I would just run them in serial, and be done with it, but since these guys are submerged pumps, I do not think it would work very well like that since the 1st pump would be pumping into the 2nd's res, and not the pump itself...

I also thought about having:

pump1 -> 1st rad -> CPU -> NB ->2nd pump -> 2nd rad -> GPUS -> pump1

But then I was wondering what would happen if one of the pumps was ever slightly more powerful than the other.. would that cause problems? Seems like if that were the case, the slower pump/res would get filled up to the max and put pressure on the lid/cap of the res and might leak? (Similar to trying to run 2 of these in serial)

Then I thought about putting "Y" or "T" adapters/splitters on the input and output of the pumps. That way, the pumps dont go into each other, but they feed into the same line, where in my mind that would give me like 2x the pressure (i know it wont be literally 2x all you hard core fluid dynamics guys ). Seems to me like this would work, and would also give me some redundancy if one pump failed, and give me much better flow than with a single pump.

Let me know what you guys think. I know I could get different parts to easily accomplish this, but I would like to stick with what I have for now.

Check out this crude drawing of what I *think* might be my best option. The "dots" are where the "Y"/"T" fitting would be.



You guys think this would work ok?
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post #2 of 14
I'd definitely exercise caution running two pumps on one loop in that configuration, I could see some kind of weird cavitation effect occuring and possibly causing issues. That said of course theory is one thing, the cold hard facts of giving it a go are another As long as you have a flow monitor and keep an eye on the temps, it can't hurt to try. I'm in a similar boat, but have stayed pure with two loops
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post #3 of 14
Looks complicated, you have two flows trying to go back into the radiator. I would just run the pump in series.

Here's sample:

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post #4 of 14
Thread Starter 
^^ thanks for the reply dude. Yea I was thinking about just hooking it up and giving it a try and just seeing what happens.. I just wanted to get the feelers out there and see what others thoguht before I spent all that time to re-configure it.

I would stick with the dual loop config, I just want a bit more cooling on my GPUs. That would required I get a bigger rad, and then I would have to get a bracket, etc, and mount it to the back of the case, and it would just be huge and I really dont want that. I'd run the GPUs on the 360 rad, but the 120 wont keep the CPU/NB as low as I want when I am crunching @ 4Ghz+ (i have actually tested that before)

That is why I wanted to combine. I know that "480mm" is plenty to cool all my stuff, I just dont want to go down to 1 pump because I think I have too much restriction with everything in there (i am running QDCs as well)

what to do... what to do... hmmm
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post #5 of 14
Thread Starter 
Quote:
Originally Posted by anoob View Post
Looks complicated, you have two flows trying to go back into the radiator. I would just run the pump in series.

i dont think running these pumps in serial will work right, since they are submerged.

I have ran 2 pumps in serial before, and worked great, but they were just regular pumps.

If I run these combos in serial, the 1st will really just be pumping into the res of the 2nd. I would bet that one of the 2 is slightly more powerful than the other, and I don;t know what kind of problems that would cause
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post #6 of 14
Quote:
Originally Posted by Phobos223 View Post
i dont think running these pumps in serial will work right, since they are submerged.

I have ran 2 pumps in serial before, and worked great, but they were just regular pumps.

If I run these combos in serial, the 1st will really just be pumping into the res of the 2nd. I would bet that one of the 2 is slightly more powerful than the other, and I don;t know what kind of problems that would cause
Look at the diagram again.
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post #7 of 14
Thread Starter 
^^ yea I see what you mean, that is like the #2 option in my OP. That was actually my first idea, but am worried that if one pump is a little weaker than the other, that its res will fill up faster, and put pressure on the lid?

I dunno.. it might work OK. I dont think it would leak, but just wanted to get some input from the clan here
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post #8 of 14

Well you could use the slow pump first in position #1 and then the fast pump in position #2 if you're worried about one pump pushing too much flow into the other one. But I think it should be fine as chipset blocks are quite restrictive it will slow your flow down a bit. It would probably bleed the air a lot faster also because the air bubbles wouldn't have to travel through 5 different blocks before getting it out of the loop.

I just don't like the idea of pumps & reservoirs being all-in-one type of solution. This forum member ended up with micro-bubbles and a cyclone effect swirling down into his outlet.

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post #9 of 14
Thread Starter 
^^ good point about the restriction slowing down the flow between pumps... I didnt even think about that, it makes perfect sense. I think I am just going to try it out and see what happens.

As far as the pump/res combos go, These little guys are the only expereince I have had with them, but like I said before, I love these things. Compact size, only $45, and I get great results. My PC has been running 100% CPU and 100% GPUs crunching 90% of the time since the build was complete, and I have never had a single problem.

My CPU loads around 38C and the "hot" GPU loads at about 55C. The CPU used to load at about 30C, but once I added the 2nd 5870 to the 120GTX loop, all my tmeps went up because the 120 cannot get rid of the heat fast enough, causing the NB to heat up the CPU loop.
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post #10 of 14
why do you need 2 pumps??
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