Intel Xeon E3 1505M v5 's Advantages
Released 3 years and 5 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (45W vs 69W)
Intel Xeon E3 1280 v2 's Advantages
Higher specification of memory (DDR3 vs DDR3)
Higher base frequency (3.6GHz vs 2.8GHz)