Xeon E6540 's Advantages
Larger L3 cache size (18MB vs 8.25MB)
Lower TDP (105W vs 120W)
Intel Xeon W 2102 's Advantages
Released 7 years and 5 months late
Higher specification of memory (2666 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (2.9GHz vs 2GHz)
More modern manufacturing process (14nm vs 45nm)