Intel Xeon E3 1275 v3 's Advantages
Higher base frequency (3.5GHz vs 1.8GHz)
Lower TDP (84W vs 225W)
Xeon 6756E 's Advantages
Released 11 years late
Higher specification of memory (6400 vs 4)
Newer PCIe version (5 vs 3)
Larger L3 cache size (96MB vs 8MB)
More modern manufacturing process (5nm vs 22nm)