I looked through the list of Geekbench 3 results of the 27 inch 2013 iMac. Alle the iMacs with highest single core and multi core scores have 4770k processors and some of them have 32 GB 2400MhZ RAM. How can this be true? I thought the CPU on the iMac was not replaceable and the iMac could only handle 16 GB 1866Mhz RAM max? What have these guys done?