Intel Xeon E5 2665 's Advantages
Lower TDP (115W vs 165W)
Intel Xeon E7 8890 v3 's Advantages
Released 3 years and 3 months late
Higher specification of memory (1866 vs 3)
Higher base frequency (2.5GHz vs 2.4GHz)
Larger L3 cache size (45MB vs 20MB)
More modern manufacturing process (22nm vs 32nm)