Re: Are there different sized DIMM's that only fit certain RAMS?
I once did this..lol, noob days! You might have DDR2 RAM, and a DDR motherboard, or, a DDR2 motherboard, and DDR RAM..
Have you tried putting the RAM in lots of different ways, as in..both ways around?
Take pics of both, and we'll be able to tell you..
And yes, to answer your question, you can get different types of RAM..with different pins and arrangements..