Opteron 8220 's Advantages
Higher base frequency (2.8GHz vs 2.2GHz)
Opteron 4310 EE 's Advantages
Released 5 years and 10 months late
Higher specification of memory (DDR3-1600 vs DDR2-667)
Newer PCIe version (2 vs 1)
More modern manufacturing process (32nm vs 90nm)
Lower TDP (35W vs 95W)