James Craner said: So I think we have established that the 680 is fast, after running a game that pushes the card hard for an hour or so, how is the fan speed/noise? Click to expand...

I've been playing X-Plane 10 with it last night to test it out a bit, this game will melt a desktop GPU with its settings on max!The fan noise is about the same level as my previous iMac (late 2009 with a Radeon 4850), but has a higher pitch sound if that makes any sense. Difficult to describe.One thing I did notice is the heat dissipation is much better. My other iMac would get red hot, whereas this one only gets hot near the opening of the rear fan, but the rest of the computer is slightly warm. The fan seems to work more efficiently since it draws in a lot of air from the vents at the bottom (where the speakers are).