What version of OS are you running? If you've upgraded to 10.2, I think you've already got the latest drivers. I'm pretty sure Apple distributes the latest Mac nVidia drivers.
But if anyone knows different, please tell. I've recently gotten a flashed PC GeForce3, and 10.1.x as well as 10.2.x has not liked it too much. I get a pretty annoying flicker doing just about anything. Everything else is great, just this pretty annoying bug. I've been hoping they'd fix it, but no luck yet. Anyone have any info on this problem or any new drivers coming out?