Xeon E7 8870 's Advantages
Higher base frequency (2.4GHz vs 2.2GHz)
Lower TDP (130W vs 250W)
Xeon 6731E 's Advantages
Released 13 years and 2 months late
Higher specification of memory (5600 vs 1333)
Larger L3 cache size (96MB vs 30MB)
More modern manufacturing process (5nm vs 32nm)