Intel Xeon E5 2660 's Advantages
Released 2 years late
Newer PCIe version (3 vs 2)
Higher base frequency (2.2GHz vs 1.733GHz)
Larger L3 cache size (20MB vs 12MB)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (95W vs 105W)
Xeon E6510 's Advantages
Higher specification of memory (1333 vs 3)