Intel Xeon E5645 's Advantages
Larger L3 cache size (12MB vs 11MB)
Lower TDP (80W vs 120W)
Intel Xeon W 2140B 's Advantages
Released 7 years and 9 months late
Higher specification of memory (2666 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.2GHz vs 2.4GHz)
More modern manufacturing process (14nm vs 32nm)