Right. I'm running Zephyroth 10.5.1 on that computer. I couldn't get 10.5.1 to install directly due to the chipset issue. I installed 10.5.1 to a USB HD using a different computer. Once the install was complete, I installed a .kext for the SB600 (it was called "SB200_400_600" or something like that (I have a poor memory and I'm at work - sorry - but I think it's listed with the rest of my specs in the "Hardware" thread - should be the 3rd working install)).

Then I connected the external drive to the 690G/SB600 machine and booted from it. It actually booted into the OS and I was able to load installers or .kexts for the 8600GT video and ALC889a audio. Runs quite well on that machine. Eventually I copied that install off of the USB drive and onto an IDE HD which I installed internally.

All that because I didn't want to learn how to inject the SB600 .kext into the Zephy 10.5.1 DVD... Like I said, I still haven't tried 10.5.2 on that computer though.

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Running both 10.5.8 and 10.6.4 on my stinking AMD/ATi machine...