Updated to 310.90 from 306.97 and Sins got really choppy/stuttered.  Started FRAPs and saw fps swing wildly and at much lower levels than usual, even drop below 20.  Rolled back driver, restarted and FRAPS lists fps 50-200+ . Hardware: i7 3770K @ 4.6 GHz, 8GB 1866 DDR3, GTX 560Ti, OCZ Vertex 4 SSD, 24" LCD 1920X1200;  Win7 Pro x64 .  Also tried with Lucid Logix VirtuMVP disabled/enabled to troubleshoot (which had no problems on 306.97) with no success.  Sins Diplomacy, single player vs 2 A.I. , saved game.  Definitely a driver issue.