You mean PC100 isn't cool anymore?

Well, last time I upgraded my computer, PC100 was the "cutting edge" solution...

My question:
In general, is PC133 backwards compatible with PC100?

I'm currently running a K6-2 350 w/ 2 64mb chips of PC100, but I plan to acquire an Athlon cpu and mobo soon. I've already committed to buying a new mobo, CPU, and hard drive. Ideally, I would like to keep the memory I've got until I can afford some new stuff, but I haven't heard any mention of whether PC100 will even run in the boards that are advertising themselves as PC133 compatible.

I know, I'm a little behind the times, but any help would be appreciated.

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  1. I know that PC100 and PC133 are interchangeable. Obviously 133 is faster. In theory I suppose. I know that a while back when I was building a system I had trouble and ended up swapping out my 133 RAM for my older 100 RAM with no problem. I think, but don't hold me to it, 150 is also interchangeable in the same fashion. It all really has to do with how much bandwidth the motherboard has to transfer data to and from RAM.

    I don't know where I heard this, but someone told me 133 was flaky with AMD processors. I haven't seen it to be so thouhg.

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  2. 133 is backwards compatable to 100. It is made the same way, it just has a higher maximum clock speed. The actual speed is determined by your BIOS configuration.

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  3. if you are installing a pc133 to a pc100 only mobo, you are downgrading your memory. buy since the pc133 is the same price as pc100, just get the pc133.

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  4. In theory, they are backward compatible (including with 66mhz). Usually, it works.

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  5. Yeah, it really is backward compatible, all the way to PC66. I'm building a new box and ordered some Crucial PC133 SDRAM. I put the PC133 stick into my 200MMX machine to test it out. It worked! Of course, since the bus on my 200MHz MMX is only 66MHz, it ran at 66Mhz.

  6. I've actually taken PC-100 RAM and un it as CAS2 PC-66 I figure you could do the same with cheapo PC-133 at 100Mhz

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