For the record:

There were some that ran at 233mhz or some such, but they are rare and stability could be an issue. I 'd stick with 200mhz in an 8500

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Back in 1998 I purchased a 604e / 233 MHz card for my 7500 -- it's still going strong and has been always rock solid.

Other than that (and the stock 601 @ 100 MHz) I've used 604/120, 604/132 and recently a tiny G3/450 card