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bottom GPU running hotter than normal - Page 2

post #11 of 12
Quote:
Originally Posted by Ekemeister View Post
if water is moving too quickly then little heat transfer takes place. That may be your problem.


I think you have a very nice system.
I have my sli run the same way one cards is hotter than the other but only by 4 deg or so. It sounds like you may have air in the block as said before try tilting the case around and see if you have any air in that bad boy
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AMD Phenom II X6 1100T Crosshair V Formula NVIDIA GeForce GTX 580 NVIDIA GeForce GTX 580 
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G.Skill G.Skill G.Skill G.Skill 
Hard DriveHard DriveOptical DriveOS
Crucial M4 2.5" 256GB SATA III MLC Internal Sol... Western Digital Caviar Black WD1002FAEX 1TB 720... SONY Black 12X BD-R 2X BD-RE 8X DVD+R 5X DVD-RA... Microsoft Windows 7 Ultimate SP1 64-bit 
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HP LED Black 27" 5ms HDMI Widescreen LED BackLi... Logitech G510 Black 18 Function Keys USB Wired ... SILVERSTONE ST1500 1500W ATX 12V 2.3 & EPS 12V ... XSPC H1 Hive Series Cube Enthusiast Water Cooli... 
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Logitech G500 10 Buttons Dual-mode Scroll Wheel... Ozone Gaming Gear GROUND LEVEL L Gaming Mouse Pad Cooler Master Circumaural Storm Sirus Headset -... XSPC Dual 5.25" Bay Reservoir - w/ Alphacool VP... 
OtherOtherOtherOther
XSPC Dual 5.25" Bay Reservoir - w/ Alphacool VP... XSPC EX360 Triple 120mm Low Profile Split Fin R... XSPC EX360 Triple 120mm Low Profile Split Fin R... XSPC EX360 Triple 120mm Low Profile Split Fin R... 
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post #12 of 12
Quote:
Originally Posted by kevingreenbmx View Post
this is bordering on truth, but for the wrong reasons. when the water moves slower, the boundary layer (section of water against the surface that does not move with the flow) gets thicker, which means that there is more material that relies only on conduction which hes a higher thermal resistivity than the combination of conduction and convection you get when the boundary layer is thin and more water is actually moving.

in practice though, flow rate has little impact on temperatures.
Lol you pretty much science-ified the word "sit" for me. Yea, whatever the real reason I've always noticed the less flow the worse the temps. Maybe other people have their own opinion based on their personal results.
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