Intel Xeon W 11955M 's Advantages
Released 7 years and 11 months late
Higher specification of memory (DDR4-3200 vs DDR3-1600)
Newer PCIe version (4 vs 3)
Larger L3 cache size (24MB vs 8MB)
More modern manufacturing process (10nm vs 22nm)
Lower TDP (35W vs 80W)
Intel Xeon E3 1220 v3 's Advantages
Higher base frequency (3.1GHz vs 2.1GHz)