Is there a bios that has the default voltage of 1.5/6v ?

Our card is acting very weird, with a mach II mounted on it.

Displaying 10 deg. in the driver with and without overclock..

The Card is a Leadtek A400 GeForce 6800 Ultra..

The ram on the card does around 1230 with out any voltmods, and the gpu runs at 460~ ..