Xeon w7 2555X 's Advantages
Released 14 years and 5 months late
Higher specification of memory (4800 vs 1333)
Newer PCIe version (5 vs 2)
Higher base frequency (3.3GHz vs 2GHz)
Larger L3 cache size (33.75MB vs 18MB)
More modern manufacturing process (10nm vs 45nm)
Xeon E6540 's Advantages
Lower TDP (105W vs 210W)