Thankyou.

After a half-hour of testing with these, the Arkham City benchmark, and the 306.23 drivers (and many comp restarts) i've decided to keep these dev ones, i liked the previous dev ones too. I'll keep the PhysX engine 0613 though, wonder why they've not started including it?

Going to give these a shot and see if it comes my handshake issue with my receiver.