Intel Xeon E5 1620 's Advantages
Higher base frequency (3.6GHz vs 3GHz)
Intel Xeon E5 1680 v2 's Advantages
Released 1 years and 6 months late
Higher specification of memory (DDR3-1866 vs DDR3)
Larger L3 cache size (25MB vs 10MB)
More modern manufacturing process (22nm vs 32nm)