Stupid question about ambient temp.

If ambient temp. is the temp. of the room in which a computer sits, then how does speed fan measure that temp.?

I was thought ambient temp was the temp inside the case. The overclocking temp guide says it's the temp in the room. Speed fan is tracking my GPU Ambient temp @ 40C at idle. Under section 5: Findings idle temp is @ 22C.

I'm really confused. Any advice?

I thought ambient temperature was the temp just outside the case? Isn't that what the guide says?

Well your gpu ambient temp would be the temp out side the gpu, or rather around the gpu.

For the most accurate results, use a thermometer outside of the intake of the case. Tjunction is also know as Core temperatures, so Core 1 and Core 2 are Tjunction temperatures. Temp 1 and Temp 2 can be other things, as in my case, one was the motherboard temp and another wasn't important. This can vary though depending on your configuration.