I have a MSI NX7900GS-T2D512E-OC.
nvidia-settings works for overclocking and downclocking the card, but
Powermizer has only two performance levels:
0 - 550 / 700 MHz
1 - 550 / 700 MHz
You can guess that's really... useful
So it's not possible to downclock on boot (xorg/dwords/powermizer)
All other nvidia cards I own have multiple (and different) power levels.
It that a bug in the card's BIOS ?
Any way to force frequency on boot instead of power levels ? (I guess no)