Intel Xeon E5 2623 v3 's Advantages
Released 3 years and 7 months late
Higher specification of memory (DDR4-1866 vs DDR3)
Newer PCIe version (3 vs 2)
Higher base frequency (3GHz vs 2.933GHz)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (105W vs 130W)
Intel Xeon X5647 's Advantages
Larger L3 cache size (12MB vs 10MB)