Intel Xeon X5667 's Advantages
Higher base frequency (3.066GHz vs 3GHz)
Larger L3 cache size (12MB vs 10MB)
Lower TDP (95W vs 105W)
Intel Xeon E5 2623 v3 's Advantages
Released 4 years and 6 months late
Higher specification of memory (1866 vs 3)
Newer PCIe version (3 vs 2)
More modern manufacturing process (22nm vs 32nm)