Should also note these are the Borderlands 2 drivers. So if your planning on playing, make sure you grab them. Borderlands 2 has PhysX, so I'd assume it's very driver dependant.
People should not let 3DMark decide the "overall speed" of your card. A slight performance drop in 3DMark, but newer games may run much better. I would always stay on the latest unless you are having a serious problem with it.
I would not consider that a big change either. That could of been caused by something running in the background. Some of your tests score higher, others score lower. If you really at 3.6GHz with 3x 670 when running 3DMark's default 1280x720 resolution you are probably bottlenecked. If I was you i'd use the extreme preset to compare scores it would probably give more consistent results.Edited by Murlocke - 9/14/12 at 8:09am