I have an Msi 6791 (no longer supported anymore, or updated???Go figure) I dont have the option with the pheonix award bios to change the clock settings, i have tried control +alt +f1, but the manual says its read only. I have p4 2.4 northwood im trying to overclock. I cant find any newer bios updates for my unsupported board. Any ideas on OC'ing this thing?

You have an old board based on a crappy SiS chipset...it's not meant for overclocking. I had a look at the manual & there's really not too much you can do with it. You cannot adjust the CPU or RAM freq in increments, you cannot lock the PCI/AGP at their defaults, nor can you increase the CPU voltage. I wouldn't expect you to be able to get the CPU freq any higher than 150MHz, & even that is being optimistic. I'd adjust everything that I could manually, then try a software overclocking program (ClockGen, CPUFSB, SoftFSB, SysTool, etc).

Under "Advanced Chipset Features", you can change the RAM frequency (set it to 133MHz) & timings (see link below).

http://www.andrew.cmu.edu/user/fma/...

Set the Command Rate at 1T.

Set the AGP aperture at 128MB, regardless of the card you're running.

Disable Spread Spectrum.

Under "Frequency/Voltage Control", you can change the CPU frequency...your choices are 100, 133, or 200MHz (set it to 133MHz).

Try to software overclock from there....