Intel Xeon X5660 's Advantages
Higher base frequency (2.8GHz vs 2.6GHz)
Intel Xeon E5 2640 v3 's Advantages
Released 4 years and 6 months late
Higher specification of memory (1866 vs 3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (20MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (90W vs 95W)