i have a Mid 2011 27inch IMac i5 processor with 4GB of ram. It takes nothing for it to become slow due to the ram getting over used.. So I'm planning on switching to 16 GB or 20 gb if I keep in the ram that's in it now. I heard placing the ram certain ways can make it better somehow. Right now 2 spots are filled 2 2GB sticks in the top going horizontal. And I'm getting 2 8GB ram sticks. Do I just stick them in the 2 bottom horizontal slots at the bottom? Also heard the iMac can go to 32 gb correct? Any advice would help.. Don't want to mess up..