My NVIDIA GTX 780 is running at around 46-50° C on idle. This only started today after dusting out my computer with compressed air. It usually runs around 25° to 30° C on idle. 45-50° C is the temperature I usually get while playing Skyrim at max with graphics enhancing mods. The only other thing that has changed is that I decided to put it on a little table next to my desk that sits about a foot lower, the table is also made out of little metal bars so that I get more air flow through the bottom. My CPU and Hard Drive still function at the normal temperatures they were before.