m66n

I put the board into a plastic enclosure and jammed a cotton ball above the processor. cpuburn-a7 has been running for over an hour and the temperature won't go above 97°C. CPU frequency toggles between 480 and 648 Mhz.
 

I have an Orange Pi One. I have an acrylic case, but the board is just laying on a table open to ambient air (25.9C). How long should I run cpuburn-a7? The board seems to be staying at 80C, and switching between mostly 912Mhz and sometimes 768Mhz.