DDR PC memory is for older PCs. There are different standards (DDR, DDR2 and DDR3) and they are NOT interchangeable so check first what you have.
Here is a list of common names found on DDR memory:
DDR-200, DDR-266, DDR-333, DDR-400
You will also hear this memory referred to as 184-pin dimm or DDR1 RAM. More information can be found here.
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