Xeon 6740E 's Advantages
Released 14 years and 3 months late
Higher specification of memory (6400 vs 1333)
Newer PCIe version (5 vs 2)
Larger L3 cache size (96MB vs 18MB)
More modern manufacturing process (5nm vs 45nm)
Xeon X7542 's Advantages
Higher base frequency (2.666GHz vs 2.4GHz)
Lower TDP (130W vs 250W)