Xeon L7555 's Advantages
Higher specification of memory (1333 vs 4)
Larger L3 cache size (18MB vs 1.5MB)
Intel Xeon D 1531 's Advantages
Released 5 years and 8 months late
Newer PCIe version (3 vs 2)
Higher base frequency (2.2GHz vs 1.866GHz)
More modern manufacturing process (14nm vs 45nm)
Lower TDP (35W vs 95W)