Intel Xeon E5 1660 's Advantages
Higher base frequency (3.3GHz vs 2.1GHz)
Intel Xeon E5 4650 v3 's Advantages
Released 3 years and 3 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Larger L3 cache size (30MB vs 15MB)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (105W vs 130W)