Xeon E 2186G 's Advantages
Higher base frequency (3.8GHz vs 2.4GHz)
Lower TDP (95W vs 250W)
Xeon 6740E 's Advantages
Released 6 years and 1 months late
Higher specification of memory (DDR5-6400 vs DDR4-2666)
Newer PCIe version (5 vs 3)
Larger L3 cache size (96MB vs 12MB)
More modern manufacturing process (7nm vs 14nm)