Intel Xeon E3 1265L v3 's Advantages
Higher base frequency (2.5GHz vs 2.2GHz)
Larger L3 cache size (8MB vs 1.5MB)
Intel Xeon D 1531 's Advantages
Released 2 years and 5 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (35W vs 45W)