Just ran some tests on my G3/600 w/Radeon 7000 that I've mega OC'd, um, changing the GPU and Memory on it had NO EFFECT on the results (I changed them, alot). See notes with Aticellerator II, turns out 3dmark, processor dependent, does not test my GPU, use Chimera for that. Explains why my benchmarks are really close to the guy with 6800, we both have G5s, fascinating to note that G5s are really close to the firepower of the new Intels though, I always wondered that. Intels still run cooler though and draw less power for same performance that being said. Just means I won't be upgrading this tower to a new Intel anytime soon.
I don't get it... this isn't 3dmark.... this is OpenMark... and it's SUPPOSED to give accurate results about your video card, and shouldn't be effected by programs you're running if they don't utilize the video card also.