Intel Xeon E7 4820 v3 's Advantages
Released 3 years and 3 months late
Larger L3 cache size (25MB vs 10MB)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (115W vs 130W)
Intel Xeon E5 1620 's Advantages
Higher specification of memory (DDR3 vs DDR3)
Higher base frequency (3.6GHz vs 1.9GHz)