Most mobos of that sort of age used jumpers to control Bus speeds and stuff rather than BIOS adjustments. See if there's anything on the mobo that lets you select between some or all of 100, 105, 112, 120, 133 or similar. Although since you'd be overclocking your RAM, and probably PCI/AGP bus too, I wouldn't hold out much hope.
People like HP, dell, IBM, etc by and large don't use enthusiast-friendly motherboards in any of their computers, so I suspect you'll find very little is tweakable.
I haven't looked into your actual PC, but I suspect you've got a dead end there. Crashman might have some idea though.
Anyway, I can help, but not with BIOS. There's a company that makes a cheap Tualatin converter that ALSO works with Coppermines and has, get this, bus speed and core voltage jumpers. If it's a Celeron 500, you can't raise the bus speed from 66 to 100MHz because the core doesn't go that far, but if it's a PIII 500, you can raise it to 733MHz by increasing the bus speed from 100 to 133MHz, using the adapter.
Compgeeks sells the adapter as a FC-PGA to FC-PGA2 adapter, but like I said, it's also capable of just adding bus speed/core voltage detection adjustments to a Coppermine. It's $8 last I looked, and if you need additional jumper settings, feel free to ask.
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