my friend gave me ram to upgrade my pc and it only fits in one side?

Q: what could be the problem? im pretty sure its ddr ram and should fit. my pc is 3 years old. it has 1 gig in it now of 2 512mb cards in it now and he gave me 2 1gig cards. help

A: There is DDR and DDR2 ,not all memory stick are the same.

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