Intel Xeon D 1557 's Advantages
Released 3 years and 11 months late
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 95W)
Intel Xeon E5 2620 's Advantages
Higher specification of memory (DDR3 vs DDR3)
Higher base frequency (2GHz vs 1.5GHz)
Larger L3 cache size (15MB vs 1.5MB)