Intel Xeon E5 2640 v2 's Advantages
Lower TDP (95W vs 215W)
Xeon 6556P B 's Advantages
Released 11 years and 5 months late
Higher specification of memory (6400 vs 3)
Newer PCIe version (5 vs 3)
Higher base frequency (2.3GHz vs 2GHz)
Larger L3 cache size (144MB vs 20MB)
More modern manufacturing process (5nm vs 22nm)