It's because with 2 monitors it idles at full clocks. If you check your clocks in msi afterburner you will see. I have a 560ti tf2 as well and just plug my 2nd monitor in my integrated. Games will usually make it hit ~65C. Mine always idles around the same temps as my hdd in my antec 300 illusion.
You did not have to make 5 threads about temps.