I have a 750GX 1.0 (maybe 1.1?) Ghz ZIF upgrade card currently in the B&W, and she runs like an absolute dream. I say maybe 1.1 because it was sold to me as a 1GHz, but runs fine at 1.1GHz using CPU Director. However, for safety's sake, we'll say 1GHz I guess.
I also have an old B&W 400MHz system if anyones interested. PM me or post here.
Ryan