Does bios automatically underclock a slower CPU?

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cooljig

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Jan 15, 2014
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I have an MSI-7046 motherboard with an Intel P4 prescott 775 3.4GHz CPU in an Advent pc which has a small psu and no space to fit a bigger one. The CPU runs cool but the psu overheats. If I replace the 3.4GHz CPU with a 3.0GHz CPU, will the Award Phoenix BIOS automatically underclock from 17x200MHz to 15x200MHz = 3.0GHz?
The BIOS won't let me enter its advanced setup screen to adjust the clock multiplier myself for the 3.4GHz CPU. ( do you know a key sequence that will let me do this? I've already tried CTL-ALT-ESC, CTL-ALT-INS, CTL-ALT-S, Shift-DEL, CTL-F1). I don't want throttling I want a fixed 3.0GHz clock.
 
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cooljig

Honorable
Jan 15, 2014
2
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10,510


Just sending me a link to the motherboard manual does not solve this!

I already have the manual and I have read it. It does not tell me how to enable the section of the BIOS setup that adjusts the (200MHz) bus multiplier. In fact most mobo manuals hide this information and usually don't tell you how to enable it, which is why I listed all of the unlocking key sequences I've already tried. I really do not want to reflash the BIOS either.

CPU-z reports that the CPU is a 550 and says the clock multiplier is adjustable from 14x-17x, so it would appear not to be locked. But the mechanism in Phoenix Award BIOS setup relating to CPU clock adjustment is effectively greyed out.

So, again, to anyone who can help:

Will the mobo automatically reduce the clock multipier to x14 if I replace the present 3.4GHz CPU with a 3.0GHz one?

Do you know a way of enabling the presently greyed-out bus speed adjustment menu in Award Phoenix BIOS?
 
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