I understand that, when comparing Quad-Core Xeons with Opterons, people focus on the scability issues of the different multi core architectures, but we've run some benchmarks on both and the thing that at the time surprised me the most was that if your application makes much use of the functions provided by Intel Math Kernel Library, a single Xeon core (e.g Clovertown) can be up to twice as fast as a single Opteron core.
You are comparing Intel MKL on Xeon with what exactly on Opteron? Intel MKL on Opteron is certainly not optimal. I hope you compared to GotoBLAS on Opteron.
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