Xeon W 1390P 's Advantages
Released 14 years and 6 months late
Higher specification of memory (DDR4-3200 vs DDR3
Depends on motherboard)
Higher base frequency (3.5GHz vs 2.667GHz)
More modern manufacturing process (14nm vs 65nm)
Xeon X5355 's Advantages
Lower TDP (120W vs 125W)