It can't be done. At least I don't believe it can. Dell gets their boards from Intel. My Intel 850 chipset board doesn't even have a clock generator that can be accessed by PLL tools such as SoftFSB.
If your board was P4 "533MHz" bus capable, you could mod the processor to make it recognised as a P4 1866MHz CPU, but I'm not sure if your board supports that bus speed, and you might need to modify even more pins to increase the core voltage...and then you might end up with a non-functioning CPU anyway.
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First you need to find out the name of the MOBO, typically is MSI or Intell, and the model name. Then replace the BIOS with the Manufactuer BIOS. Speaking as a ex dell tech this is going to be a major pain in the butt and if it does work you will have to use a retail copy of windows.
well i know its the intel 850 chipset, the board is green so that also spells intel.. but its a propherity(sp) board. Ive heard of software that will unlock the bios to the o/c settings, in fact ive seen someone download it, but i cant seem to find it now.
second thing, were would the bios be? is it the thing under the big black heat sync?
Yeah those Dimenions 8100 and 8200 use the rambus memory. I believe that the 8100s use the pc 800 memory still but either way pentiums can ony be oced by their clock speeds and you are already it the max clock speeds the ram can take. OC rambus it generally a bad idea or in more vauge terms OCing OEM machines is a bad idea. You might get a couple MHZs out of the FSB but nothing more than that.