Xeon E7520 's Advantages
Released 109 years and 2 months late
Lower TDP (95W vs 160W)
Intel Xeon E5 2693 v3 's Advantages
Higher specification of memory (2133 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (2.8GHz vs 1.866GHz)
Larger L3 cache size (30MB vs 18MB)
More modern manufacturing process (22nm vs 45nm)