Intel Xeon E5640 's Advantages
Lower TDP (80W vs 130W)
Intel Xeon E5 1650 v2 's Advantages
Released 3 years and 6 months late
Higher specification of memory (1866 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.5GHz vs 2.666GHz)
More modern manufacturing process (22nm vs 32nm)