Intel Xeon E5640 's Advantages
Higher base frequency (2.666GHz vs 2.5GHz)
Lower TDP (80W vs 270W)
Intel Xeon w7 3455 's Advantages
Released 12 years and 11 months late
Higher specification of memory (4800 vs 3)
Newer PCIe version (5 vs 2)
Larger L3 cache size (67.5MB vs 12MB)
More modern manufacturing process (10nm vs 32nm)