Im pretty sure if they clocked it higher that would be bad end result with no fan. It says operating temp is 40 in a 25 degree environment.
I'm not sure on that. Look at what sidehack was able to do with a chip. I mean it's able to do 8GH easily with no issues.
But I guess it depends on design. We really don't know what kind of heatsink they have on chip. If they did a small really cheap one it could take moding to safely go higher.