doesn't the 6360 motherboard require a different power supply? I know that you can use a 6300 motherboard (I actually had a 630 that had this done to it), but not the 6360 unless you replace the PSU.

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I don't know about the PSU. That may be an issue. I actually have a 6320 board here that I wanted to use, but I think the PRAM battery is dead, so I was never able to test it. The 6360 is the same form factor with the same connectors so that much isn't an issue. A compatible power supply still shouldn't cost much if it is a problem.

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I think that the fact that it's a complete redesign of the logic board and CPU is the reason for the PSU replacement.

Eureka! The explanation is at the end of this article:

http://lowendmac.com/macdan/md030.shtml

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Hmmm OK. You learn something new all the time. At least now I also know that my 6500 main board also won't work (electrically)in a 63x case. I don't see how he can say the 6360 can be upgraded to a 6500, though, as the PCI riser card is too high to clear the smaller opening on the back of the 6360 case. To put the 6400/6500 board in you basically give up your PCI slots because even after removing the riser card it does leave you with one PCI slot, but you can only put a half height card in it because a full height one won't make it into the case.