Running all Games i play on Windows 7 x64 7100 with no problems, only had to:
turn off ALL Rx/Tx checksums in IPv4 (those were the mayor cause with Windows 7 lags)
My system: i7 920/ 12Gb 1066mhz / 1TB hdd / GF9600EN OC 512 @ 500mhz (underclocked)
i prefer coolness/silence over speed, playing the games full detail with no problems on a 26" (1900x1440)