i have 4 different kinds of memory. Centon 1gb. Aeneon 512mb. ProMos/Mosel Vitelic 256mb. and a generic 256mb stick. the two 256's were given to me and are pc 2700. the first two i bought and are pc3200 which is what my computer works better with. i was wondering if having the same brand and same size memory work together better to speed up the system? or should it just be the same size and both pc3200. i was thinking of getting rid of the 256's and buying a kingston 1gb stick so i'll have 3gb. but keeping one of the 256's so i have even more memory. and also is 3gb going to be an improvement from 2gb all that much? sorry if confusion occurs.