You can force any drivers as The Karmakazi said. I'm running 186.18. Are you running dual or single PCB? The older drivers don't work as well with the single pcb. I haven't tried 190 yet but might give it a go. Also set memory lowgap to auto in bios so you will have at least 1.5GB of avail system memory. This improved my gpu's performance in vantage. I still seem to score better with 3 GTX 280's in 3DMark 06 than with 2 GTX 295's.