G4 350 (AGP), 320 MB (2-2-2).
I have not run the CLI client under X for a while, since the OS 9 client with RAM disk is faster. The last time was under 4K33 I believe - it has been long enough (and enough X updates) that I should try it again.
If memory serves, my speeds came in the 15-20 hour range under darwin 1.2. Speed was variable depending on how "interesting" the work unit was.