Well I had mine overclocked from stock 2.4ghz to 3.3ghz but didn’t try any higher (and I’m sure it can go higher)
Specs:
Core 2 Duo E6600 2.4ghz@3.3
Asus P5B-E P965 Motherboard
EVGA Geforce 8800GTS 640MB
2gb (1gb x 2) OCZ Platinum PC2-6400
2 x 160gb Hitachi Deskstar SATA2 in RAID0
Ultra X-Connect 500W PS
Antec Super Lanboy
Benq FP202W 20.1″ LCD
Logitech MX700 mouse
Ideazon Zboard & Logitech MX5000 keyboard