Intel Xeon E5 2643 v3 's Advantages
Released 3 years and 5 months late
Higher specification of memory (2133 vs 1333)
Higher base frequency (3.4GHz vs 2GHz)
Larger L3 cache size (20MB vs 18MB)
More modern manufacturing process (22nm vs 32nm)
Xeon E7 4820 's Advantages
Lower TDP (105W vs 135W)