Intel Xeon E5 2666 v3 's Advantages
Released 1 years and 2 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Higher base frequency (2.9GHz vs 1.8GHz)
Larger L3 cache size (25MB vs 10MB)
Intel Xeon E5 2403 v2 's Advantages
Lower TDP (80W vs 135W)