You should try the 71.84 drivers, I got 3300 in 3dmark05 stock once I used those compared to 3088 under 66.94
Just posted this in another thread. I've kept a record of various conditions, these are my best stock and OC'd scores under various benches:
3dmark03
Stock @ DDR400 @ 2.5GHz - 71.84 Drivers- 7663 - 3dmark03(Build 360)
564/1101 @ DDR400 @ 2.5GHz - 71.84 Drivers- 8615 - 3dmark03(Build 360)
3dmark05
Stock - DDR400 - 2.5GHz - 71.84 - 3312 - 3dmark05
564/1101 - DDR400 - 2.5GHz - 71.84 - 3796 - 3dmark05
Aquamark3
Stock @ DDR400 - 2.5GHz - 71.84 - 49,494 - Aquamark3
564/1113 @ DDR400 - 2.5GHz - 71.84 - 53,192 - Aquamark3