How to tell DDR from DDR2

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I recently purchased an HP desktop which comes with 2 of 512MB 1Rx8
So the total RAM is 1GB.
I ordered 2 of 1G DDR2 3200 from
But the delivered memories don't fit in the slot.
I compared them with the original memories and the shape is different.
How do you tell DDR from DDR2?

I suspect that the ones from are not DDR2 even if the label
says DDR2.
I will call but I want to know the fact.



Re: How to tell DDR from DDR2

DDR is 184 pins, while DDR2 is 240 pins in desktops.

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