Intel Xeon E5 1620 's Advantages
Higher base frequency (3.6GHz vs 2GHz)
Lower TDP (130W vs 250W)
Xeon 6746E 's Advantages
Released 12 years and 3 months late
Higher specification of memory (5600 vs 3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (96MB vs 10MB)
More modern manufacturing process (5nm vs 32nm)