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RivaTuner won't let me change fan speeds

Knuckle

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Joined
Jan 12, 2008
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Processor Intel C2D E6750 @ 3.3 GHz
Motherboard Asus P5K
Cooling ThermalTake BigTyp 120 VX
Memory 2GB OCZ @ ~416 MHz; 5-5-5-15
Video Card(s) XFX 8800 GTS 320 MB @ Core:654 MHz Mem:1065 MHz
Storage 2x320 GB WD
Display(s) Samsung 206BW
Case NZXT HUSH
Audio Device(s) Creative XtremeMusic
Power Supply Corsair HX320W
Software Vista Ultimate x64
Right, I've borrowed my friends old 7600 GT while I get my video card replaced, but in games like Dark Messiah the temps jump up to 80 degrees plus w/o even oc'ing the thing. So I wanted to use RivaTuner to up the fan speed from 30something% to 80-100%. However, it won't let me. I can check "Enable low-level fan control" all I want and raise it to 100%, but I don't hear a difference in the fan sound, and when I get back to the settings, it has jumped back to 30. I reinstalled my drivers for this card (removed using DriverCleaner, then installed again), so I don't know what I'm doing wrong. Can anyone help me?
 
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