I only use my machine for css and surfing - however when I moved up to the 22 inch widescreen monitor I needed to up the resolution and this lowered my FPS. I can't handle having a pc with ANY issues with FPS so bought the fastest gfx card possible and built up a serious gaming machine.
It just laughs at css atm. I have bioshock too and it also laughs at that.
I would have to start playing a more cpu intensive game to make it worth upgrading any more as its already very quick
I left out all the geeky details - but be assured every part is top notch.
Cheers
RW