.. folks seem to run at 20 - 25 MHz even after they've swapped in an 88916. There might be problems if the 88916 gets hot or otherwise loses margin, I imagine.

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I don't quite follow you.. are you saying that people swapped 88920 for 88916 and are wondering why their computers aren't working at 40 MHz or are you saying that they swapped 88920 for 88916, changed resistors to go to 33 MHZ, added 20 MHz oscillator to go to 40 MHZ and then backed back to 20 - 25 MHZ because their Q605's were unstable?

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The datasheet says that the 88920 is for slower 20 - 25 MHz operating frequencies. And that the 88916 isn't suited for the slower speeds. However, when doing a careful modification, the first step is to remove the 88920 and install an 88916. Then retest to make sure the board still works. At that point, one is operating at 25 MHz and it works fine, even though it's not recommended with the 88916.

That is what I mean.

I wish I had somehow gotten more now, as I only have two.

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What? Isn't that enough? How many Quadras are you going to overclock?

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I have two Q605s. When I'm done, I'll have no 88916s in my parts supply.

Although I am happy to see John's offer. If only I can remember it when I eventually get back to this project. I've implemented a new rule for myself, where I buy nothing until the moment I'm ready to use it. No more, "I'll buy this. It will be useful in that project three years from now and might be hard to find then." That's how I ended up with a living room (soon to be attic) full of electronic crap....