Intel Xeon E3 1220 's Advantages
Lower TDP (80W vs 160W)
Intel Xeon E5 2687W v3 's Advantages
Released 3 years and 5 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Larger L3 cache size (25MB vs 8MB)
More modern manufacturing process (22nm vs 32nm)