Intel Xeon E5 4603 's Advantages
Lower TDP (95W vs 130W)
Intel Xeon E5 1660 v2 's Advantages
Released 1 years and 4 months late
Higher specification of memory (DDR3-1866 vs DDR3)
Higher base frequency (3.7GHz vs 2GHz)
Larger L3 cache size (15MB vs 10MB)
More modern manufacturing process (22nm vs 32nm)