I have 2 different RAM spots on my motherboard and I have 1 RAM stick that is 256 MB and it has 2 little slots on the bottom, and I have another 128 and 256 MB that have 3 little slots at the bottom. I installed both of them but I only get 256 MB from the 2 slot stick. I took the 2 slot stick out in put in my 256 and my 128 and I get 304 somethin like that. Now, my question is can i put all the sticks in there and get like 640MB of RAM?