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I have a GeForce GTX660 and a GTX8800 on my system.
When I had Windows 7 they both were quiet a lot. Now after the upgrade to Windows 8 I notice the following: when system boots up the fans spin fast during the very early initial phase (which sounds correct) but when Windows starts, they slow down to a more quiet speed.
After turning on from standby, the fans spin at maximum speed (and maximum noise). After upgrade from Windows 7 to 8 I reinstalled NVidia drivers just to make sure the system was running them (i.e. Windows 8 setup didn't replace them with its own integrated drivers).
When I had an NVidia-based motherboard, I could change GPU fan speed from NVidia Control Panela after installing NForce driver. Now my motherboard is AMD-based but SLI-compliant (it's a Sabertooth 990FX by ASUS, based on AMD 990 chipset).
How can I tell the GPU fans to stay quiet unless I'm playing a 3D game?
Looks like this helped me investigate more. The GTX8800 is detected with the yellow triangle by the device manager, so no other software detects it and controls its fan speed. The 670, instead, is slown down fine by the system itself and/or by Afterburner – usr-local-ΕΨΗΕΛΩΝ – 2013-05-16T11:53:30.203
why do you try to use both? The 8800GTX is very old and much slower. – magicandre1981 – 2013-05-16T19:05:32.230
I have set it to primary PhysX adapter just to avoid throwing it :D:D but now that you ask I never actually asked myself if keeping the card is worth or not (and I never benchmarked because of laziness) – usr-local-ΕΨΗΕΛΩΝ – 2013-05-16T19:47:35.330
ok, you should remove the card, because the old is too slowly:
http://selfdeprecatingjournalism.blogspot.de/2011/11/using-your-old-graphics-card-to-run-as.html