Intel Xeon E5 2690 's Advantages
Higher base frequency (2.9GHz vs 1.9GHz)
Lower TDP (135W vs 250W)
Xeon 6766E 's Advantages
Released 12 years and 3 months late
Higher specification of memory (DDR5-6400 vs DDR3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (108MB vs 20MB)
More modern manufacturing process (7nm vs 32nm)