Actally, AMD did make a 133MHZ 486. I belive it was produced in 1994. but Intel only made 486's up to the speed of 100MHZ. I prefer AMD because of the speed over Intel.

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Actually, Intel DID make 486-133s. They were DX4 chips, and had a limited production run. And I know this for sure because I have one. =)

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That's what I was thinking... I just remembered that someone else I know has a PC that says "CPU type 80486" (not exact wording) and "132Mhz CPU clock" at startup.

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Sounds like a upgrade cpu?...most likily a turbo chip? Mine posts 486@132/133 (depends on turbo on/off(?)) Windows sees it as 486 ,but I think it was SAW that saw it as amd586 at 133. I need to look again...I think that I ran something in DOS/or3x that told me that it was clocking actually @128.

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I also have one CPU like that. That is actually a 486 chip. (Architecture, fits in instead of any 486 chip.) But, as for performance it runs on 133 Mhz (there is also a 160 Mhz version). What is special, that it multiplies by 4. (and has more cache, tha other 486s) ("standard" Intel 486s multiply by 3 - a DX4 100 Mhz 33x3). It is 4x33 Mhz. (160 Mhz: 4x40 Mhz). Its proper name is AMD 5x86. But its not a Pentium yet. The 133 Mhz one is called AMD 5x86 P75S, which means it runs like a 75 Mhz Intel Pentium. Bios may say, it is an 5x86, other test programs and Windows say it is a 486 (and it is more that, than a P.). The situation is similar with the Cyrix 5x86, which is a version of the 6x86 for the 486 socket, running at 100-120 Mhz)

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nnpocse is correct and exact I had 2 amd 5x86 boards both also had pci slots one even had a vlb slot and 72 pin ram slots. amd also made a 486-120 ( 40 mhx x3) the 5x86 ( 133 was 33 x 4 ) the intel dx4-100 was 33 x3 ( not 4) some boards would run the 486-133 at 40 x 40 mine would not. i think cyrix made a chip faster than 100 mhz but it's hard to tell as they used a deceptive " pr" rating. one of the difficulties with the 5x86 ( 133) chip was lack of motherboard support the m-tech r-418 required a bios upgrade and jumper settings from the manufacturer's web site or it would only work as a 100 or 120. ----------- the dx9700 (m919) had a non-flashable bios but supported the 5x86 without upgrades. it was an inter4esting but basically a cheap board. many who did not have support on their boards, used an "interposer" ( adapter) to provide the 3.3v and other things required by older 486 motherboards the "speed up" kits would work in most boards that had a 33 mhz clock setting and you may still see them around. the price was very high and it is more economical to get a faster board wdegroot@ptd.net

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Ok, just to confirm some #s on my turboChip puter. Bios says Am486DX-Plus 132 mhz HEINFO sees as AMD am5x86 134 mhz The mobo is a generic Vesa. The jumpers are well marked...besides sx/dx/dx2/amd, there are jumper settings for dx-sl, p24d, cx486sx, cx486dx, and umc. Am I stuck @133mhz or do I still have some options? what are these? p24d? umc?? Walter, I think that the costs of upgrading the board vs. cpu (at least as far as TurboChip otion) has leveled out. I got my Kinston TC on ebay for $14.00. I think they retailed above $100 just a few years ago. It made this (almost)useless box useful again.

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Uhh dont know what the original post was anymore, but let me contribute to this posting by saying: I have an AMD 586DX 133 (P75S) too. Its correct that this is basically a 486 (socket 3) that runs at 133 Mhz. Although I have the processor I can confirm its hard too find a (socket 3) motherboard that supports it! After experimenting with some mainboards and jumpersettings I am currently running it at 150 Mhz (at least it says ;-)! Its not so stable though, since Windows 9x refuses to install at this speed! Luckily DOS/Windows 3.1x does run!

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OVERCLOCK THAT THING!

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