Nvidia GPU overheating

Hi all
Any help would be good, cant keep killing cards :(

HI,
Been lurking::-) Thanks for the info on afterburner, my gtx460 was running 77c and there isnt space between it and its compainion gtx560 to put another cooler in.. Afterburner allowed me to push the fan to a higher % it was running at 46% with the temp at 77c:-( Now its at 81% and the temp on the card is down to between 56c and 65c.. min 12c lower.

Regards,

It needs fresh air moving through the case from front to rear. You'll need one or two large fans in the front to push air into the chassis. If there are vents in your case on the sides or bottom plug those up. You want the chassis under positive pressure so that you can be sure any air entering it is cool ambient air from the front. It's the recirculation of already ehated exhaust that causes problems. There needs to be large grilles in the rear to vent the positive pressure. The GPUs exhaust hot air both to the rear and to the interior of the chassis in the surrounding space. The worst thing that can happen is for that hot air to be drawn back into the GPU fan in a continuous cycle, that's why you want the air inside the chassis to be exchanged at a rapid rate.
I run three EVGA GTX-570 cards in a 790i Ultra motherboard and an Intel Core 2 Quad Extreme QX9650. All run at OEM clock speeds. Two 3.5" NMB 3610KL-04W-B39 fans quietly push fresh air in through the front directly in the direction of the GPU fan intakes.

At 70' ambient and full SETI@Home utilization:
CPU runs about 155' F
GPU 1 runs about 190'F
GPU 2 runs about 155'F
GPU 3 runs about 180'F

(PCIe x16 slot config in this board is 1-3-2, so #2 is the only one with unobstructed fan intake.)

With PC Power and Cooling 1250 watt PSU system is 100% reliable and issueless.

-James