Intel Xeon W 2123 's Advantages
Higher base frequency (3.6GHz vs 3.3GHz)
Lower TDP (120W vs 210W)
Xeon w7 2555X 's Advantages
Released 7 years late
Higher specification of memory (4800 vs 2666)
Newer PCIe version (5 vs 3)
Larger L3 cache size (33.75MB vs 8.25MB)
More modern manufacturing process (10nm vs 14nm)