Xeon D 2899NT 's Advantages
Higher base frequency (2.2GHz vs 1.8GHz)
Lower TDP (135W vs 225W)
Xeon 6756E 's Advantages
Released 6 months late
Higher specification of memory (6400 vs 3200)
Newer PCIe version (5 vs 4)
Larger L3 cache size (96MB vs 30MB)
More modern manufacturing process (5nm vs 10nm)