I run 5 box teams with :

GA-MA770-UD3 rev1
AMD Phenom 8650 x3 Triple Core 2,3Ghz
Sapphire Radeon HD 4670 1GB GDDR3
4 x Corsair CM2X2048-6400 (tot 8gb)
22" Samsung Syncmaster 226BW

Win XP 64, ISboxer, Innerspace

System use 47% Ram and 80% Cpu power with 5 Wow and a couple of Firefox Windows Running.