I was watching some of your reviews online, and I was curious if you've ever considered trying to maintain a closer ambient temperature when testing heatsinks to provide the fairest test
The reason I suggest it, is because based on thermodynamics, heat transfer has a multiplicative effect based on the difference of the two items temperatures which are touching. Meaning, more heat will transfer at a faster rate between two things (air and the heatsink fins/pipes) when the difference in their temps are greater.
Meaning, when you test two heatsinks at different ambient temperatures, the Delta Temp you measure when the ambient temps are higher will actually be skewed due to the multiplicative effect.
I don't know if this makes a huge difference in air cooled heatsinks as I've never tested it, but theoretically it would.
You cant test the difference it would make easily. Use the same rig/setup voltages, settings, etc at two difference ambient temps in the room.
If the delta temperatures for the cpu are the same/similar, then it doesnt have an effect; however, if they are different, it would show that the ambient temperature has an effect on the delta temperatures you are measuring, putting rigs in a higher ambient temp room at a disadvantage