Intel Xeon W 2135 's Advantages
Released 8 years late
Higher specification of memory (2666 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (3.7GHz vs 3.333GHz)
Larger L3 cache size (8.25MB vs 8MB)
More modern manufacturing process (14nm vs 45nm)
Xeon W5590 's Advantages
Lower TDP (130W vs 140W)