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Very first loop: are those temps normal or I'm expecting too much? - Page 2

post #11 of 13
Quote:
Originally Posted by pc-illiterate View Post

if you are truly running your 780s in parallel, 1 block has an air bubble im guessing. those temps should be within a couple degrees of each other 5-10*.
2 reasons to run parallel over serial. keep temps almost identical and lessen restriction. the gpu temps are about right for serial though.

Serial setup would not cause more than ~1-2C difference between 2 gpu temps, and typically less than that. It takes 400W to heat water by 1C at 1.5gpm (typical loop flow). Even with crappy flow, 0.75gpm, still takes 200W to heat water by 1C. With serial gpu's, typically second gpu sees water 1C higher, gaming less than that. But it is common to see 2 serial or parallel GPU temps with 5-10C difference just from mass production sloppy tim application and less than ideal tightening of screws.

My last serial setup of gpus, I had one that was 2C higher than the other. Funny thing, when I was measuring water temps for testing blocks, turns out the gpu that was getting warmer water (by 0.5C) ran the coolest. The 0.5C water temp difference between serial gpus was irrelevant in face of gpu mounting difference of 2.5C between the two. As an aside, because of all the screws to tighten, when remounting gpu blocks, I easily get 3-4C difference mount to mount even carefully doing it, and if screws arent tightened properly, can get 20C difference. It is only cpu temps where mount variance can be easily maintained to 1C, since only 4 screws and defined tightening endpoint on some.
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post #12 of 13
yep, my bad. i was thinking of something else apparently. those gpu temps should still be closer. 10* is a huge difference for a parallel gpu set-up.
i dont know how hot 780s run but, i still think all the temps are high. poor fans and ambients maybe? he has a lot of rad space for what he is cooling.
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post #13 of 13
I have a GTX 670 a Danger Den GTX480 ExtremeII Rad and I hit 50-55C on my GPU with the fans on super low speed. That is stock voltage too. That's after hours of playing and like I said super low speeds. If I let the fans keep the rad room temp then the card doesn't go above 40... but who cares... 10-15C is worth silence.
Edited by givmedew - 8/20/13 at 9:09pm
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