Intel Xeon E3 1220 v2 's Advantages
Higher base frequency (3.1GHz vs 2.6GHz)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (69W vs 115W)
Intel Xeon E5 2689 's Advantages
Higher specification of memory (1600 vs 3)
Larger L3 cache size (20MB vs 8MB)