Originally Posted by Steffen M.
"nvclock" unfortunately doesn't support the GTX 5xx series. "nvidia-settings" can't be used to modify the fan speed, either. While I've set the option "Coolbits" "5" in xorg.conf, it seems that this option is not applied to the GTX 580, as this card is actually not used for X in my setup. I have an old 6600GT which does the graphics (and is used by X). The GTX580 is only used for calculations.
Thank you very much in advance!
Just follow these instructions:
i.e. temporary connect a second monitor (there is also another way) and then just add in the Section "Screen":
Option "ConnectedMonitor" "CRT"
Option "Coolbits" "5"
and you will be able to control the fans. I use that and it works under Suse and GTX580 3GB.