Intel Xeon E5 4640 's Advantages
Larger L3 cache size (20MB vs 11MB)
Lower TDP (95W vs 140W)
Intel Xeon W 2145 's Advantages
Released 5 years and 3 months late
Higher specification of memory (2666 vs 3)
Higher base frequency (3.7GHz vs 2.4GHz)
More modern manufacturing process (14nm vs 32nm)