I was lazy and kept using my then new iMac from June 2011 with the built in 2x4 GB factory ram and kept the extra 2x4 Corsair laptop ram, I bought, in my drawer until I felt the need for more ram. Now I've started using Photoshop, Dreamweaver, illustrator and some video editing and need my 8 extra GB of RAM. But I want to make sure my 2 x 4 Gb ram from Corsair is installed so that they are in the same channel and the 2 x 4 Gb ram from Apple are in their channel. This because I've heard this will make the chances of everything running smoothly larger. Is this rubbish and should I just open the ram door and install my 2 new block in the 2 empty ram slots and turn it on. Or can I optimise my chances of everything running smoothly by placing my 2 Corsair in either the 2 left/right slots or in the 2 upper/lower slots ? Thanks in advance. I did a search, but for some reason didn't find any answers to this exact situation.