Intel Xeon E5 1680 v3 's Advantages
Higher specification of memory (DDR4-2133 vs DDR3)
Higher base frequency (3.2GHz vs 2.8GHz)
Larger L3 cache size (20MB vs 8MB)
Intel Xeon E3 1505M v5 's Advantages
Released 1 years and 1 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (45W vs 140W)