Yes.. 3dmark06 is entirely vertex setup fetch limited in all but one of the game tests. Plus the CPU score mod so a fast CPU makes all the difference in this bench. ((3dmark05 has the exact same problem)). Unfortunately when designing 3dmark06 they didnt fix any of the real problems with the default benches.
Hopefully with the Geometry shader and DX10. Some of these CPU geometry setup issues can be alleviated. The CPU seriously shouldnt be too involved with 3D performance in the fashion it is with 3dmark06.
__________________
|CPU: Intel Q6600 Quad Core @ 3.2 Ghz|Mobo:EVGA Nforce 780I @ 1470 FSB|Memory:4 Gig Corsair XMS2 DDR1066|Video:Geforce GTX 260x3 SLIMonitor:1680x1050\/Olevia 27 Inch Widescreen HDTV 1920x1080
|CPU: AMD Phenom 9600 Black Edition @ 2.5 Ghz|Mobo:Asus M3n HT Deluxe Nforce 780A|Memory: 2 Gigs Corsair Dominator @ 1066| Video: Geforce GTX 280x2 SLI