Well, since you mentioned it, I figured I would install doom3 on the GF's
system and see how it runs. It's a AMD 3800+, 2GB of ram, and a ATI X850
card. Vista32 running the 7.1 drivers. It's also a dual boot system and
here's what I saw with Doom3
Under XP,at 1024x768 on high, No shadows it got a score of 87.
Under Vista, same settings, it's highest score was 65. With shadows on, the
score was 52.
What is the benchmark scores you are seeing under Doom3.
Also, is your memory 2x1GB or 4x512MB ? I noticed on alot of AMd system,
when you run 4 chips, it drops the memory speed down to 333 or 266. You have
to go in and set memory speed to manual and make sure it's 400. Originally I
ran the test at 333 and I couldn't score abouve a 55. if your memory speeds
are wrong, it possible that's your big problem.
I have a 3rd home system, that is a AMD 3400+ with a basic nVidia 6600, with
1GB of ram and Vista64 and it even managed to score a 54. So if you system
is scoring less than a 60, then I'd imagine there is something wrong. One
thing you could try is it log-in under a different account, turn off all
the windows Themes, and run the benchmark again.