Intel Xeon E5 2660 v2 's Advantages
Released 3 years and 6 months late
Newer PCIe version (3 vs 2)
Higher base frequency (2.2GHz vs 1.866GHz)
Larger L3 cache size (25MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon L5609 's Advantages
Lower TDP (40W vs 95W)