Intel Xeon E3 1220 v2 's Advantages
Larger L3 cache size (8MB vs 6MB)
Lower TDP (69W vs 95W)
Intel Xeon E3 1285 v4 's Advantages
Released 3 years and 1 months late
Higher specification of memory (1866 vs 3)
Higher base frequency (3.5GHz vs 3.1GHz)
More modern manufacturing process (14nm vs 22nm)