CPU Temperature readings

[brenainn]

I have run into a bit of confusion as to what temperature my cpu is actually running at. I just recently installed a closed loop liquid cooling unit, and was going to begin overclocking. However I am getting two different readings for the cpu temp, and I don't know which is correct. My motherboard debug readout it showing 33C while CPUID HWmonitor is showing 16C. Which is correct?
Thanks for any input.

 

[ATMINSIDE]

Please list the system components as seen in my signature.

 

[brenainn]

Processor AMD FX 8350
MB MSI 990fxa-gd80v2
Cooler CoolerMaster Seiden 240M
Video MSI Radeon R9-270 2GB GAMING OC Edition
OS Drive Radeon R7 240gb SSD
PSU Rosewill Xtreme 750
Memory 4x8GB Crucial Ballistic Tactical Tracer PC3-10700 8-8-8-24
Case Antec (model unknown)

 

[ATMINSIDE]

Motherboard is correct. Software monitoring isn't accurate until about 40°C for the FX processors.

 

[Mandrake4565]

Motherboard is correct. Software monitoring isn't accurate until about 40°C for the FX processors.

^^^This^^^ and I'll add the motherboard is likely reading the Socket temp which there is an actual sensor for and the 16c Hwmonitor reading is the package/core temps which is an algorithm (no actual temp sensor) that AMD has stated and also as Atminside alluded to, is not accurate until around 40-45c when under load.