Intel Xeon E5 2660 's Advantages
Lower TDP (95W vs 130W)
Intel Xeon E5 2690 v2 's Advantages
Released 1 years and 6 months late
Higher base frequency (3GHz vs 2.2GHz)
Larger L3 cache size (25MB vs 20MB)
More modern manufacturing process (22nm vs 32nm)