Intel Xeon E5 1620 's Advantages
Higher base frequency (3.6GHz vs 2.6GHz)
Intel Xeon E5 2650 v2 's Advantages
Released 1 years and 6 months late
Larger L3 cache size (20MB vs 10MB)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (95W vs 130W)