I just installed a new graphics card in my home PC. It's a fairly high end one, and I'm running the desktop at 1280 x 1024 x 32bit colour.
This work PC is running at 1280 x 1024 x 24bit colour, and for what I do, that's perfectly OK. I'm not actually asking for a replacement yet. But it's a 4MB graphics card, whereas the home one is a 256MB card. Yes, that's 64 times as much RAM. The amount of RAM in a graphics card has doubled eight times since this machine's card was high end.
Moore's law seems inadequate for that.
(ATI are now talking about release a 512MB card pretty soon now.)