Intel Xeon E5640 's Advantages
Larger L3 cache size (12MB vs 8.25MB)
Lower TDP (80W vs 120W)
Intel Xeon W 2125 's Advantages
Released 7 years and 5 months late
Higher specification of memory (2666 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (4GHz vs 2.666GHz)
More modern manufacturing process (14nm vs 32nm)