Xeon X5355 's Advantages
Higher specification of memory (DDR3
Depends on motherboard vs DDR3)
Intel Xeon E3 1270 v2 's Advantages
Released 5 years and 6 months late
Higher base frequency (3.5GHz vs 2.667GHz)
More modern manufacturing process (22nm vs 65nm)
Lower TDP (69W vs 120W)