Opteron 1381 's Advantages
Higher specification of memory (1333 vs 3)
Higher base frequency (2.5GHz vs 2.4GHz)
Intel Xeon E5 2440 's Advantages
Released 2 years and 11 months late
Larger L3 cache size (15MB vs 6MB)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (95W vs 115W)