I am still looking for the 300 MHz card from my 8600, which I packed away somewhere ages ago. I figure that especially with all of the G3 upgraded PowerMacs out there, there would be quite a lot of these 604s available. But the reality is that I hardly ever find any. I think the fastest I have heard of was about 333-350 MHz? Also I know that there were dual cards, but they seem to be more scarce. Were there 604e/ev upgrade cards also? There must have been a year or so before everybody jumped onto the G3 wagon.

So which are the best 604s? And where are they all, anyway?