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PC-100 or PC-133 SDRAM will not fit into a DDR SDRAM slot. If you look at the bottom edge you will see that the number of notches and the spacing of them are completely different. Even if they did use the same sockets, they are not at all compatible with each other, to the point that if you have a motherboard with both sockets you would only be able to use one type of RAM at a time.

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Q: What will happen if you place an old stick of PC-100 or PC-133 RAM into a newer motherboard running 256MB DDR RAM?
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