Intel Xeon E5 2670 's Advantages
Higher base frequency (2.6GHz vs 2.3GHz)
Lower TDP (115W vs 215W)
Xeon 6556P B 's Advantages
Released 12 years and 11 months late
Higher specification of memory (6400 vs 3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (144MB vs 20MB)
More modern manufacturing process (5nm vs 32nm)