My friend bought an Imac. I gave him the advice to buy 16 GB RAM not from the Applestore. It's an Imac 27 inch Quad 2.93 with 256 GB SSD and 2TB harddisk. Now I hear that 16 GB RAM can cause a lot of trouble in iMacs. There are several stories of random shutdowns in Apple Forums. Is there anyone from you who did have bad experiences with 16 GB RAM in a iMac 2010?