IBM 46M1038 INTEL XEON E5540 QUAD-CORE 2.53GHZ 1MB L2 CACHE 8MB L3 CACHE 5.86GT/S QPI SOCKET-B(LGA-1366) 45NM 80W PROCESSOR ONLY FOR SYSTEMS X3550 M2, X3550 M3, X3650 M2, X3650 M3. SYSTEM PULL. IN STOCK.