Introduction: From on the naming of the drivers you'd probably notice very little difference, and to be honest there probably is other than some bug fixes found with some machines (DV settings mainly).
Testing methods
Benchmarks used:
F.E.A.R (built in performance tester)
3D Mark 06 and Vantage
Crysis War Head (benchmark application from here, using the ambush map)
S.T.A.L.K.E.R Clear Sky For IQ testing, along with F.E.A.R MP
