E5520 - Intel Xeon E5520 Quad Core 2.26GHz 5.86GT/s QPI 8MB L3 Cache Processor

E5530 - Intel Xeon E5530 Quad Core 2.40GHz 5.86GT/s QPI 8MB L3 Cache Processor

E5540 - Intel Xeon E5540 Quad Core 2.53GHz 5.86GT/s QPI 8MB L3 Cache Processor

E5603 - Intel Xeon E5603 Quad Core 1.60GHz 4.80GT/s QPI 4MB L3 Cache Processor

E5606 - Intel Xeon E5606 Quad Core 2.13GHz 4.80GT/s QPI 8MB L3 Cache Processor

E5607 - Intel Xeon E5607 Quad Core 2.26GHz 4.80GT/s QPI 8MB L3 Cache Processor

E5620 - Intel Xeon E5620 Quad Core 2.40GHz 5.86GT/s QPI 12MB L3 Cache Processor

E5630 - Intel Xeon E5630 Quad Core 2.53GHz 5.86GT/s QPI 12MB L3 Cache Processor

E5640 - Intel Xeon E5640 Quad Core 2.66GHz 5.86GT/s QPI 12MB L3 Cache Processor

E5645 - Intel Xeon E5645 6 Core 2.40GHz 5.86GT/s QPI 12MB L3 Cache Processor

E5649 - Intel Xeon E5649 6 Core 2.53GHz 5.86GT/s QPI 12MB L3 Cache Processor

E56491 - Intel Xeon 6 Core E5649 2.53GHz 5.86GT/s QPI 12MB L3 Cache Socket FCLGA1366 Processor