Intel Xeon E5 2663 v3 's Advantages
Released 2 years and 4 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Larger L3 cache size (25MB vs 8MB)
Intel Xeon E3 1275 v2 's Advantages
Higher base frequency (3.5GHz vs 2.8GHz)
Lower TDP (77W vs 105W)