I may have the answer to the freezing in games on a NF3 . downloaded the 6.37NV chipset drivers and used the 4.40 gart driver .The 5.10 I think has the 3.36 drivers No more freezing in FARCRY and the overclocking works 400/1100
Give it a go
UPDATE 1 hour of UT2003 benchmark and no freezing [1280x1024/2Q/8]
EDIT: tryed the 77.72 drivers got green text on start up and my benchmarks freeze up [on a 6800gt] gone back to the 77.30 drivers.
EDIT 2: Had a freeze up so I set my O/C to 350/1100