I don't know the answer. I have an old computer that gets the proc. speed adusted via jumpers on the mobo. It is a 75 Mhz Pentium that is overclocked to 100 Mhz right now. When I try to raise the speed to even the next highest point, 133, I get no display. The screen simply will not show anything. The computer makes the regular sounds of booting, but I don't see anything at all. Is there anything I can do so I can o.c. a little more? Thanks.