So I'm trying to upgrade my ram..I've asked this question a couple times but no one is answering it right I don't think..so here's a better way to ask it I think...I'm buying 2 x 4gb ram..1 has a configuration of 256meg x 64 and the other has a configuration of 512 x 64.. crucial says both are compatible with my computer.from what I'm gathering that has to do with the amount of modules.256 will have twice the modules of 512.and I gather that they both equal the 8gb I'm trying to achieve..is there a difference in anything besides how it's configured on the stick of ram..is one ultimately better somehow?if one is will it even be noticeable..on crucial the 256meg is half the price of the 512meg 8gb of ram.is it simply bc making a stick with half the modules is half the price bc it's using half the material to make? Thank you very much.