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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.

Yes, the previous run was 912 Mhz @ 1.1 V exclusively. I've ordered a heat sink because I was hitting 93C (making Guile 2.0.11 from source) with a build from 11 May, but it hasn't arrived yet. Here is a shot of my OPi One setup: It's resting on a silicone coaster on a coffee table open to the air in the room. I changed the fex file settings as indicated: From 12:32 to 13:01, I ran configure and make -j 5 on Ruby 2.31 source code, then sysbench to 13:32, and finally cpuburn-a7.

I modified orangepione.fex to reflect the values in this GitHub comment and reran ./compile.sh to generate an Orange Pi One image. Here's a graph of that: The ambient temperature is 23.1C.

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.