How is the nVidia Quadro4 980GXL able to best the ATi Fire GL X1 in 5 out of the 6 Viewperf benchmarks?

[Random Variable]

Quadro4 980GXL:
(IBM Intellistation M Pro with a 3.06GHz Pentium 4 and 512MB of dual-channel PC2100 DDR SDRAM)

3DStudioMax - 17.82
Design Review - 85.87
Data Explorer - 108.56
Lightscape - 29.17
Pro/Engineer - 22.20
Unigraphics - 20.36

Fire GL X1:
(Dell Precision 350 with a 3.06GHz Pentium 4 and 512MB of dual-channel PC1066 RDRAM)

3DStudioMax - 16.42
Design Review - 66.13
Data Explorer - 95.08
Lightscape - 23.72
Pro/Engineer - 18.56
Unigraphics - 25.49

http://www.spec.org/gpc/opc.data/vp7/summary.html

 

[Acanthus]

probably driver optimisations..

or a lack thereof.