Hey guys I was wondering how the memory on the 27" iMac needs to be installed in order to take advantage of the dual channel speeds. In my old MacPro we had to do it in pairs. Do I need to do that on the iMac as well! I'm going to keep the 8GB (which I saw is 2x4GB) and also install 2x8GB. Should I install them as 4-8 4-8 or as a 4-4 8-8? Thanks in advance for your answers.