Intel Xeon E5 1660 v2 's Advantages
Higher specification of memory (DDR3-1866 vs DDR3)
Higher base frequency (3.7GHz vs 3GHz)
Larger L3 cache size (15MB vs 8MB)
Intel Xeon E3 1575M v5 's Advantages
Released 2 years and 4 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (45W vs 130W)