Hello! I have recently bought a 27" iMac with the i5, 6970M vid card and 4gB of DDR3 with the intention of maxing out the RAM (after-market). I have seen some conflicting information so I'm wondering if someone can confirm if I can, in fact, add 4 8gB sticks to get to 32 gB? I know there are 4 slots, but are there any limitations I may not be aware of? Help appreciated!