|Thanks for the replies so far.|
I don't play any offline games due to a lack of spare time (wife, kids, work etc). I will try one of my (old) games when I get home from work.
The driver is version 18.104.22.168 which it says is the latest available.
Power supply is an OCZ700SXS.
Output is 3.3v - 36A, 5v - 30A, 12v1 - 18A, 12v2 - 18A, 12v3 - 18A, 12v4 - 18A.
Hope that helps.