Intel Xeon E3 1220 's Advantages
Released 1 years and 2 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.1GHz vs 2.266GHz)
Larger L3 cache size (8MB vs 4MB)
More modern manufacturing process (32nm vs 45nm)
Xeon EC5539 's Advantages
Higher specification of memory (1333 vs 3)
Lower TDP (65W vs 80W)