I was in the not having issues camp. Then I decided to buy a Crucial M4 SSD as an OS drive.
I loaded Win 7 back on. Downloaded all the updates for Windows, mobo, and Vidcard and now I'm having issues.
I'm not sure what changed (other than the SSD) that could be doing it, but my FPS spikes all the way down to 20fps on a GTX580.
I'm sad.