Xeon X5355 's Advantages
Higher specification of memory (DDR3
Depends on motherboard vs DDR3)
Intel Xeon E3 1280 v3 's Advantages
Released 6 years and 7 months late
Higher base frequency (3.6GHz vs 2.667GHz)
More modern manufacturing process (22nm vs 65nm)
Lower TDP (82W vs 120W)