Intel Xeon X5660 's Advantages
Larger L3 cache size (12MB vs 8MB)
Intel Xeon E3 1220 v2 's Advantages
Released 2 years and 2 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.1GHz vs 2.8GHz)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (69W vs 95W)