Intel Xeon L5609 's Advantages
Released 9 months late
Larger L3 cache size (12MB vs 6MB)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (40W vs 115W)
Opteron 1381 's Advantages
Higher specification of memory (1333 vs 3)
Higher base frequency (2.5GHz vs 1.866GHz)