Intel Xeon Phi 7210 's Advantages
Released 9 years and 7 months late
Higher specification of memory (DDR4 vs DDR3
Depends on motherboard)
More modern manufacturing process (14nm vs 65nm)
Xeon X5355 's Advantages
Higher base frequency (2.667GHz vs 1.3GHz)
Lower TDP (120W vs 215W)