Opteron 4334 's Advantages
Released 2 years and 9 months late
Higher base frequency (3.1GHz vs 2GHz)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (95W vs 105W)
Xeon E7540 's Advantages
Higher specification of memory (1333 vs 3)
Larger L3 cache size (18MB vs 8MB)