Intel Xeon E5 2666 v3 's Advantages
Higher specification of memory (DDR4-2133 vs DDR4)
Higher base frequency (2.9GHz vs 1.3GHz)
Lower TDP (135W vs 250W)
Intel Xeon Phi 7285 's Advantages
Released 3 years and 1 months late
More modern manufacturing process (14nm vs 22nm)