Intel Xeon E3 1226 v3 's Advantages
Higher base frequency (3.3GHz vs 2.7GHz)
Lower TDP (84W vs 325W)
Xeon w7 3555 's Advantages
Released 10 years and 3 months late
Higher specification of memory (4800 vs 1600)
Newer PCIe version (5 vs 3)
Larger L3 cache size (75MB vs 8MB)
More modern manufacturing process (10nm vs 22nm)