Intel Xeon E5 2640 's Advantages
Higher base frequency (2.5GHz vs 2.4GHz)
Lower TDP (95W vs 129W)
Xeon D 2799 's Advantages
Released 9 years and 11 months late
Higher specification of memory (3200 vs 3)
Newer PCIe version (4 vs 3)
Larger L3 cache size (30MB vs 15MB)
More modern manufacturing process (10nm vs 32nm)