Xeon 6746E 's Advantages
Released 9 years and 7 months late
Higher specification of memory (5600 vs 2133)
Newer PCIe version (5 vs 3)
Larger L3 cache size (96MB vs 25MB)
More modern manufacturing process (5nm vs 22nm)
Intel Xeon E5 2666 v3 's Advantages
Higher base frequency (2.9GHz vs 2GHz)
Lower TDP (135W vs 250W)