Intel Xeon E5 2666 v3 's Advantages
Released 10 months late
Higher specification of memory (DDR4-2133 vs DDR3-1333)
Higher base frequency (2.9GHz vs 2.2GHz)
Larger L3 cache size (25MB vs 15MB)
Intel Xeon E5 1428L v2 's Advantages
Lower TDP (60W vs 135W)