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Parallel water cooling (video cards) - Page 2

post #11 of 20
I'm thinking that might be the case, that's what the guy in the linked HardForums thread has.
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post #12 of 20
It's best to have inlet and outlet on different cards. I experimented with parallel about 2 weeks ago and found that if you have inlet and outlet on the same card temps for the bottom 2 cards (tri sli) were 5c hotter than when using series and parallel with inlet and outlet being opposite netted 1-2c better temps than series at load
 
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post #13 of 20
What were your temps in series for comparison? It's interesting that it was only 5C over 3 cards, I'm pretty sure that it's a flow issue for me, but I'm seeing 4x as much heat increase. I'll post back when I reconfigure, most likely tomorrow.
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post #14 of 20
Ok, so a little testing with F@H seems to point to a transfer issue between block and GPU. Card idles at about 40+ above ambient, and instantly heats up when F@H starts on that core. Now the question is that the mount looked good, but the performance clearly isn't there. I'll open a new thread that's more relevant, but just to note; my issues do NOT seem to be coming from parallel vs series for those that refer to this thread in the future.
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post #15 of 20
Thread Starter 
Temps in series for the second card are 2-3C higher idle and load. I'll leave it.
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post #16 of 20
you should test both, I know you like taking your loop apart
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post #17 of 20
actually, the MPC 655 has a much higher flow rate than the little ones, but the little ones offer higher pressure. i believe that with the 655 you would want to do parallel because of the lower pressure but higher flow rate, it could handle it, and your restriction would be lower and easier on the low pressure of the pump. however, the other parts of you loop may be the restriction. So if you do a dedicated loop, parallel for SURE with a 655. If you do parallel on the GPU do parallel on the MB/CPU if you are doing both.
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post #18 of 20
Sorry to bring up this old thread. Your parallel example Will not work. The water Will always take the easiest Way through the system. The route with less resistance, thus it Will go into the first gfx and out of the first gfx again. Only very little water Will pass through the second card.
post #19 of 20
that doesn't make sense because the second card would ultimately fill with water before any water would escape back through the top card.
post #20 of 20
Parallel cooling must be done with flow control. You can achieve flow control by using valves or by simply making the loops to each load the same length. I see people using the multiple connections on the loads for splitting: why not use splitters (tees) instead? This way you can ensure that all the loops are the same length, and thus have the same flow.
The pros of parallel cooling is that each load gets exactly the same temperature water. The pros of serial cooling is that each load gets the same flow of water.
In order to play it safe, one should have a powerful enough pump: This way purging air from the system is easier to do, and there is enough flow for all the loads.
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