Intel Xeon E3 1220 v3 's Advantages
Higher base frequency (3.1GHz vs 1.8GHz)
Lower TDP (80W vs 225W)
Xeon 6756E 's Advantages
Released 11 years late
Higher specification of memory (6400 vs 1600)
Newer PCIe version (5 vs 3)
Larger L3 cache size (96MB vs 8MB)
More modern manufacturing process (5nm vs 22nm)