DDR and DDR2 ram help?

How do I know if I have DDR2 or DDR ram? I tried to install new ram I pulled from a newer dell into my older dimension 2.40 and when I applied pressure only one side locked in correctly.

How do I know if I have DDR2 or DDR ram? I tried to install new ram I pulled from a newer dell into my older dimension 2.40 and when I applied pressure only one side locked in correctly.

senses_fail_06

To find out the kind of RAM your Motherboard uses, check with the manufacturers website.

download cpu-z run it and check in the memory tab what kind of memory you have, to make sure the memory you're trying to install is compatible

 http://www.cpuid.com/cpuz.php

Thanks so far guys, but how do I tell what RAM I am using like from stick to stick? Or can you not tell?

Get Everest Ultimate Edition.Sordidus

Getting something like that for someone at his computer knowledge level would be a waste of money.