Gee, my K7M has been pretty stable. That's an AMD750 chipset board, Instigator.
Guess that depends on your definition of stability though . . . I was mildly disappointed when I had to reboot it the other day. It was the first time in a month.
Putting a blanket statement out that AMD boards are finicky about power supplies and memory is somewhat misleading. Sure, the original Athlon sucked up a lot of power, which explains the power supply, but at least they could still use standard ATX supplies, unlike say, that new P4 chip - some company named Intel makes it? - that needs an entire new ATX standard to function.
And my BH6 - and Intel BX chipset board - absolutely refused to work with cheap SDRAM. I returned it, ordered some Micron Crucial, and didn't have a problem with the board. The same memory works flawlessly in my AMD setup.
IMHO, don't b!tch about system instability if you're going to use crappy components.