How many Bloody Marys have you had? - Richard Faria, Temonmichi
According to AMD Zone, that poses a heap of questions about performance, given the Opteron has additional sets of GPR and SIMD registers for programs specifically compiled for the platform.
And now the site has benchmarked Seti@Home on the Opteron.
You can find the preamble and the actual benchmarks, starting on this this page. ยต