Intel Xeon W 2140B 's Advantages
Released 7 years and 10 months late
Higher specification of memory (2666 vs 1066)
Newer PCIe version (3 vs 2)
Higher base frequency (3.2GHz vs 2GHz)
Larger L3 cache size (11MB vs 8MB)
More modern manufacturing process (14nm vs 45nm)
Xeon EC5509 's Advantages
Lower TDP (85W vs 120W)