i know this post is probably stupid but o well ill make it anyway my system beats urs and mine is outdated except the video card basically
i have:
gigabyte ga-7vt600 mobo
athlon xp 3200+
1gb of crappy offbrand elixir ram not in dual channel
and a 6800 non gt which is just about the same as the 6600gt but has 4 more pipes but also only has normal ram and is clocked at 750 mhz instead of the gddr3 that the 6600gt has

i guess what im really getting at is why my system which is worse then urs except for the video card can score almost 2000 more points then urs on 3dmark03