Intel Xeon D 1577 's Advantages
Released 5 years and 11 months late
Higher specification of memory (4 vs 3)
Newer PCIe version (3 vs 2)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 60W)
Intel Xeon L5638 's Advantages
Higher base frequency (2GHz vs 1.3GHz)
Larger L3 cache size (12MB vs 1.5MB)