Xeon 6746E 's Advantages
Released 14 years and 4 months late
Higher specification of memory (5600 vs 1066)
Newer PCIe version (5 vs 2)
Larger L3 cache size (96MB vs 8MB)
More modern manufacturing process (5nm vs 45nm)
Xeon EC5509 's Advantages
Lower TDP (85W vs 250W)