Mac Pro (Under XP) - 3DMark Tests

[Sveetly]

I was wondering why my Mac Pro under XP Pro is delivering lower scores in the 3DMark tests than PCs with similar specs.

An Intel Core 2 Quad (2.66GHz) with an ATI Radeon HD 3870 x2 and 2GB RAM scores 19137 3DMarks, while my Mac Pro, 2x2-Core Xeon (2.66GHz,) also with a 3870 x2 and 5GB RAM (Windows doesn't use it all - I know) scores a meager 12136 3DMarks (Both 3DMark06.)

I could understand that the Xeons probably aren't as good with games and graphics, but the difference is pretty large.

I get equally poor scores compared to the same computer in the PCMark05 tests. (8299 vs. 5136)

Any guesses to what might be going on?

ALSO: In tests with actual games, my frame rates were lower than comparable systems.

 

[macz1]

Perhaps it's the relatively high memory latency of FB-DIMMS
Mac Pros aren't really meant to play games with, which means that you have to accept somewhat lower fps. That's the cost of versatility and reliability. Nevertheless I find that a Mac Pro handles most games quite well.

 

[macz1]

And installing the newest drivers can also improve thigs considerably. If you are using the AMD bootcamp driver replace it by the newest standard catalyst driver (8.8 I think).
Bootcamp drivers for windows are quite old (and senseless in my opinion)