Intel Xeon E5 2667 v2 's Advantages
Released 3 years and 6 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.3GHz vs 2.8GHz)
Larger L3 cache size (20MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon X5660 's Advantages
Lower TDP (95W vs 130W)