Intel Xeon E5 4640 's Advantages
Lower TDP (95W vs 270W)
Intel Xeon w7 3455 's Advantages
Released 10 years and 9 months late
Higher specification of memory (DDR5-4800 vs DDR3)
Newer PCIe version (5 vs 3)
Higher base frequency (2.5GHz vs 2.4GHz)
Larger L3 cache size (67.5MB vs 20MB)
More modern manufacturing process (10nm vs 32nm)