Intel Xeon E3 1225 v5 's Advantages
Higher base frequency (3.3GHz vs 1.8GHz)
Lower TDP (80W vs 225W)
Xeon 6756E 's Advantages
Released 8 years and 8 months late
Higher specification of memory (DDR5-6400 vs DDR3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (96MB vs 8MB)
More modern manufacturing process (7nm vs 14nm)