Intel Xeon E5 1686 v3 's Advantages
Higher base frequency (2.6GHz vs 2.1GHz)
Lower TDP (135W vs 165W)
Intel Xeon Gold 6338T 's Advantages
Released 6 years and 7 months late
Higher specification of memory (DDR4-3200 vs DDR4-2133)
Newer PCIe version (4 vs 3)
Larger L3 cache size (36MB vs 30MB)
More modern manufacturing process (10nm vs 22nm)