Intel Xeon D 1581 's Advantages
Released 2 years and 5 months late
Higher specification of memory (4 vs 3)
Higher base frequency (1.8GHz vs 1.7GHz)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (65W vs 70W)
Intel Xeon E5 2650L v2 's Advantages
Larger L3 cache size (25MB vs 1.5MB)