I'm running some tests right now on my CPU @ sub degree temperatures via Phase cooling. The temperature should be close to -50c which is the readout on the evap, however I seem to be hitting a wall @ -9c as for what the comp itself is reading.
If I undo the Overclocking / lower voltages, the temp still sits at -9c, as opposed to lowering. This is shown in the BIOS as well as realtemp when booted.
I'm currently using an Asus Rampage III Extreme with the most recent BIOS update. This mobo was supposedly designed for extreme Overclocking via methods like LN2, so I would think it'd have sensors for sub degree temperatures.
I'll attach an image of the RealTemp sensor test, so you can see when it hits the -9c wall.
Any help is appreciated.