Intel Xeon E5 2643 's Advantages
Released 4 years and 7 months late
Higher specification of memory (3 vs 2)
Newer PCIe version (3 vs 1)
Higher base frequency (3.3GHz vs 3GHz)
More modern manufacturing process (32nm vs 90nm)
Opteron 2222 's Advantages
Lower TDP (95W vs 130W)