afni.nimh.nih.gov

We recently did some rough benchmarks that might help you.
The task was a rather hefty 3dDeconvolve script.

AMD Athlon 2200+ 3 hours 44 minutes
1.4 GHz Intel ~4 hours, 30 minutes
Dual 1GHz G4 2/GB RAM (OSX) ~4 hours, 40 minutes
Same machine as above using 3dDeconvolve_f ~2 hours, 52 minutes
Dual 1GHz xserve (Linux) 5 hours, 35 minutes
SGI Origin 2000 (6 195 MHz procs) 4/GB RAM ~8 hours
1 195 MHz SGI processor 1/GB RAM ~9 hours


Emmette