Intel Xeon E5 2643 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (2133 vs 3)
Higher base frequency (3.4GHz vs 2GHz)
Larger L3 cache size (20MB vs 15MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 2620 's Advantages
Lower TDP (95W vs 135W)