1). It won't work at all.
2). It will work but be unstable and cause crashes.
3). It'll work perfectly.
And that goes for just using PC133 alone and for mixing and matches PC133 and PC100/PC66. Using PC133 alone offers a better chance for it working perfectly then mixing it. Many PC133 sticks are of higher density and use a slightly different manufacturing process that sometimes makes them incompatible with older memory and motherboards. But unless you try you won't know. If possible get PC100 RAM.
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