I just picked up a 27" late 2013 imac -3.2GHz quad-core Intel Core i5 at Best Buy yesterday. I wanted to install more ram right off the bat before I even brought it home so I had the geeksquad do that for me and install two more 4gb for a total of 16. I previously put corsair in my macbook and haven't had an issue. They were out of corsair that I would have needed for this imac so I let them talk me into PNY (PC3-10666). I don't know much about the brands but after researching once I got home, i come to find PNY has a bad reputation. Also, now i notice the ram specs say 1333mhz but my imac specs on the box say 1600mhz. I'm a little worried about this being cheap ram. I finally saved the money for this and I don't want to have problems down the road. Can this cause any damage if it's bad ram long term to my computer? Any suggestions on what I should do? I was contemplating returning the whole thing and getting a new one. I haven't noticed any problems yet, but it's only been less than a day, are there problems that could occur later? Any opinions are much appreciated!