3.33GHz Intel Xeon X5680 6 Core 6.4GT/s 12MB L3 Cache Socket LGA1366 SLBV5 1366 / B / LGA1366 Socket (Size 1.77" x 1.67" / 4.5cm x 4.25cm) Designed for SERVERS and not for regular motherboards Requires bios update in order to be recognized