Intel Xeon E7 4820 v3 's Advantages
Larger L3 cache size (25MB vs 22.5MB)
Lower TDP (115W vs 165W)
Intel Xeon Gold 5515 's Advantages
Released 8 years and 6 months late
Higher specification of memory (DDR5-4800 vs DDR3)
Newer PCIe version (5 vs 3)
Higher base frequency (3.2GHz vs 1.9GHz)
More modern manufacturing process (10nm vs 22nm)