Opteron 2218 HE 's Advantages
Higher base frequency (2.6GHz vs 2GHz)
Lower TDP (68W vs 80W)
Intel Xeon E5503 's Advantages
Released 3 years and 1 months late
Higher specification of memory (3 vs 2)
Newer PCIe version (2 vs 1)
More modern manufacturing process (45nm vs 90nm)