If I may make an observation........
You guys with the 64 processors should be kicking my butt. I'm not even going to post my aquamark scores, for fear of the riot that would ensue when I keep getting better fps in AH than you do. Thing is, most of the people I see posting these days with frame rate problems have newer, more powerful computers. My old Barton XP2600+, just from internal design alone, should be inferior at almost any processing chore than a Athlon 64. The only difference I can see is, I have a dedicated gaming setup where most of you guys are using one setup for both gaming and everyday stuff.
And I dont mean I have 2 computers on my desk either. Just 2 hard drives, with 2 totally separate copies of WindowsXP. I'm running 11 processes at startup on my gaming setup (just stripped down WinXP, Aces High, and drivers). The BIOS is cleaned up and optimized to reduce memory usage. I've gone over every tweak guide I can find and set my video card and Windows settings to allow for best performance, while still giving me some quality.
http://www.tweakguides.comYou can find Windows tweaks, BIOS tweaks, video card tweaks, you name it he has it there. There are others I use too, but that one has some of the most current info, and the most all in one place.
Seriously, I dont look at it as a matter of pride that my system beats newer ones in AH, I look at it as people trying too hard to compromise home and game use. Skuzzy has posted a formula to use for your AH settings and video card settings to make sure you arent overloading your video memory. Tweaks are there for anything you want. Use them and you can be happy instead of frustrated.

One other thing. Registry cleaners. Learn to love them. Even your registry can slow down Windows if it gets clogged enough with old junk (or even new junk). The more programs you install, the slower that computer is going to run.