Intel Xeon E3 1220 v3 's Advantages
Higher specification of memory (DDR3-1600 vs DDR3)
Higher base frequency (3.1GHz vs 1.3GHz)
Larger L3 cache size (8MB vs 1.5MB)
Intel Xeon D 1577 's Advantages
Released 2 years and 8 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (45W vs 80W)