The new driver gives me that old "insane flickering" in Dx9 everything off. In 1.8 I had to turn motion blur on -- or use the compromise fix
r_MotionBlur = 1
r_MotionBlurShutterSpeed = 0.0001

It went away for me in 1.9 and 275.50 but has now returned no matter what the in-game setting of motion blur is. Changing the MOTION BLUR menu setting to any value then back again fixes it.

Indeed, this cvar sequence in game.cfg also fixes it:

r_MotionBlur = 1
r_MotionBlur = 0

(SLI 2x460 w/768)

Any chance (no pun intended) you knows if this only happens with SLI?

Yes, it is an SLI problem. The release notes from nVidia cite it as one of the non-fixed issues in this driver.

So how's the performance overall for this new driver? Don't get to play it until Monday night...

I get texture flicker but only when i play with DX11 i have no SLI :/