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I've got an Abit BM6 running a Celery 400@500.
The PCI and AGP busses (not sure about ISA) are adjustable as a ratio of the FSB through the BIOS. I believe 3/4, 1/2, 1/3, and 1/4 are my options.
I run the FSB @ 83 MHz vs. the 66 MHz default. PCI is spec'd @ 33 MHz, but I run it at 1/3 of 83 which is a little less than 28 MHz, thus it is underclocked. I can't recall AGP spec, is it 66? I think I may run AGP at 3/4, so 62 MHz. ISA is spec'd at 16 MHz, dunno what that's running.
What you can adjust depends on your MB and the BIOS used. Most manufacturers will put a BIOS that supports whatever the MB is capable of, however it really depends on both hardware and software to function. And this is, of course, assuming you've got a normal consumer board, not an OEM board that system manufacturers like Dell use.
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