i used to have a pentium 3 that ran at 1ghz and i put server 08 on it. took all night to install. that's with 512mb of ram at like 100mhz. and in the end it went up in smoke and i turned it in to art.
Left: IBM ThinkPad A21p
Center: HP w2007 monitor, currently connected to desktop
Right: HP Pavilion dv9700t (folding )
The desktop isn't actually a 1999 Compaq, it's a Sempron build in a 1999 Compaq case (with a glowing blue LED fan where the old USB ports used to be, actually looks pretty cool).