Intel Xeon E5 2620 's Advantages
Higher base frequency (2GHz vs 1.3GHz)
Larger L3 cache size (15MB vs 1.5MB)
Intel Xeon D 1571 's Advantages
Released 3 years and 11 months late
Higher specification of memory (DDR3 vs DDR3)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 95W)