Xeon L5645 's Advantages
Higher specification of memory (1333 vs 3)
Higher base frequency (2.4GHz vs 2.1GHz)
Lower TDP (60W vs 80W)
Intel Xeon E5 2620 v2 's Advantages
Released 2 years and 7 months late
Newer PCIe version (3 vs 2)
Larger L3 cache size (15MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)