Xeon E 2434 's Advantages
Higher base frequency (3.4GHz vs 1.9GHz)
Lower TDP (55W vs 250W)
Xeon 6766E 's Advantages
Released 6 months late
Higher specification of memory (6400 vs 4800)
Larger L3 cache size (108MB vs 12MB)
More modern manufacturing process (5nm vs 10nm)