o/c ing a Pentium

I was wondering why i cant push the clock multiplers on 1st gen Pentiums over 2x. I have a pentium 75 running at 133 thats 66x2 and a 90 running at 120 60x2. Temp is not an issue they just won't boot when I rase the multiplyer? Any help would be nice.

How do you know it's not a heat related problem? Actually, that's pretty good overclocking for those old P-I CPUs. Seems like they always liked lower multipliers and higher FSB. Won't the P-90 run at 2X66 too?

I'm fairly sure it is not a heat problem because the heat sinks on both of them are in full contact with the processors but are not very hot. I am fairly sure the 90 wont boot at 2x66 becase if it had I would have left it there and not on 2x60.

Twinkle said:

I'm fairly sure it is not a heat problem because the heat sinks on both of them are in full contact with the processors but are not very hot. I am fairly sure the 90 wont boot at 2x66 becase if it had I would have left it there and not on 2x60.

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It is the processer itself that is limiting the overclocking. Some aren't that stable at all past the stock speed. Take the 120Mhz Pentium...I have had a couple of these and they will not overclock. Now go to the Pentium 133Mhz. I can easily hit 200Mhz with them. What happened is Intel made a chip and then tested it for stock cpu speed. If a 133 wasn't stable they declocked it to 120. I hope this info helps.

I guess that is one way to look at it. I guess I should just be happy with what I have so far.