Intel Xeon X5660 's Advantages
Larger L3 cache size (12MB vs 10MB)
Lower TDP (95W vs 130W)
Intel Xeon E5 2637 v2 's Advantages
Released 3 years and 6 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.5GHz vs 2.8GHz)
More modern manufacturing process (22nm vs 32nm)