I have 2 of these exact cards in SLI and they are great. One card by itself will run cold and quiet; for me in SLI I need to run the fans high to stay around 68 on the top card, bottom 52-58, in 5760x1080. In 1080p they run SLI quieter and cooler. Some heat is exhausted inside the case. They are OCd to 1256 in game boost I believe, and +300 memory in afterburner. Will OC more, I just don't need to really. Love the cards.