Xeon w7 3555 's Advantages
Released 13 years and 4 months late
Higher specification of memory (4800 vs 3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (75MB vs 8MB)
More modern manufacturing process (10nm vs 32nm)
Intel Xeon E3 1220 's Advantages
Higher base frequency (3.1GHz vs 2.7GHz)
Lower TDP (80W vs 325W)