Re: 260GTX nvidia-drivers-190.42-r3 - powermizer issue
Exactly the same story with 180.60. I downgraded to xorg-server 1.6.5 and kernel 126.96.36.199
By default card stays on lowest clocks settings (despite reporting maximum performance) - (powermizer2.png)
Running "nvidia-settings -q all" clocks jump to level 1 (powermizer3.png).
If there's anything else I can do to help - please let me know.