TjMax is the temp that the CPU starts to regulate itself to keep from burning up.
The thermister under the CPU is typical labled "CPU temp"even though it's not. It's a carry over from the days before there was an internal temp sensor.
The applet Core Temp and other temp applets that read the internal CPU core temp the same as Core Temp does are most accurate in the 40C-70C range. The farther the temp gets from 40C the more inaccurate the readings. Thus idle temps are completely inaccurate but they matter not anyways. The only temp that really matters is the full load temp. As long as you stay below the 24/7 internal core temp for your specific model FX CPU all is fine.
Thermal margin is just AMD Overdrive's calculation of thermal headroom between the current CPU internal core temp and TjMax. In the case of the FX-8000 series CPUs the TjMax is 70C. The max 24/7 temp however for the FX-8000 series is 61C so the thermal margin deal is bogus and misleading by 9C on the FX-8000 series. Other models of FX CPUs can have different max 24/7 and TjMax temps. AMD however does not list all of the proper tech info. online as they should...
Testing has shown that the FX-8000 series can start to show BSODs, crashes and freezes at temps in the 65C-66C and higher range - well before the 70C TjMax temp is reached. That is why you want to use the 24/7 max internal core temp of 61C and NOT use the latest version of AOD which is defective in design by showing a false thermal margin based off of 70C instead of 61C. AMD's published tech specs for some of the FX-8000 series confirms the 61C max 24/7 temp and AMD engineering has also confirmed this to me personally in writing.
Building a reliable PC involves more than just assembling the parts. You need to be able to configure all of the BIOS settings appropriately. This can be quite involved and frustrating as it can require a lot of trial and error with stress testing. It is however often the only means to get a 100% reliable PC.
09:42 PM by