Xeon E5420 2.5GHz S771 w/o Fan
Xeon E5420 2.5GHz Quad-Core Socket 771 (Dual-Processor) - 1333MHz FSB - 2x6MB L2 Cache - Intel64 - Intel Virtualization Technology (VT-x) - 80W TDP - Retail Box w/ Passive Heatsink - Socket LGA 771 / J
Xeon E5620 2.4GHz Quad-Core LGA1366 (Tray)
2.4GHz 4 Core - 8 Threads - 2.66GHz Turbo - Socket LGA 1366 / B - 2-Way SMP - Supports DDR3-1066 Memory - 4 x 256KB L2 Cache - 12MB L3 Cache - 80W TDP - Intel VT-x / VT-d / VT-c Virtualization - Westmere-EP 32nm - OEM/TRAY w/o Heatsink & Fan
Xeon E5-4655 v4 2.5GHz Eight-Core (Tray)
2.5GHz 8 Core - 16 Threads - 3.2GHz Turbo - Socket LGA 2011-v3 / R3 - 4-Way SMP - Supports DDR4-2133 Memory - 8 x 256KB L2 Cache - 30MB L3 Cache - 135W TDP - Intel VT-x / VT-d Virtualization - Broadwell-EP 14nm - OEM/TRAY w/o Heatsink & Fan