Intel Xeon E7 4820 v3 's Advantages
Released 3 years and 3 months late
Higher specification of memory (1866 vs 3)
Larger L3 cache size (25MB vs 20MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 2665 's Advantages
Higher base frequency (2.4GHz vs 1.9GHz)