Originally Posted by Undervolter
According to recent post of "the Stilt", the "socket temp" is an on die temp. So the BIOS can't affect it when delidding. With this in mind, by delidding, the surface of the die is cooled faster, due to the direct contact with the CPU cooler, instead of having the solder and the IHS interfering (hypothesis of course).
Yes I read his posts. very informative, but cpu and bios must work together. Just because a cpu has a max setting before shut down or throttling, does not mean the bios was written for a different temperature. I've noticed with my Asus boards across platforms with a stock auto all setup, Cpu socket temp at 65c will throttle.
However being my chip is de-lidded and I have noticed big changes, I cannot replicate running a Cpu socket temp higher than the cores.
One reason maybe that removing the copper and where it is glued down to the processor PCB may eliminate any heat transfer from that IHS plate back down to the Cpu PCB. Thus the processor PCB is going to report a lower temp as a result. Since my first Phenom processor, I've noticed a considerable drop in Cpu socket temps every single time I remove the soldered IHS plates and can only think the PCB would absorb heat from that IHS plate and even through the glue.
The IHS plate is a heat collector. The more copper the more heat you can store before dissipation. And THIS brings you back to Stilt's post about copper in the PCB of the motherboard transferring heat between Cpu and VRMs. Or VRMs to Cpu. Even the processor pins accumulate heat and is dissipated in through the socket, so having a fan on the back of the motherboard helps dissipate that transferred heat.
A motherboards bios however can be written to throttle a processor and VRM output voltage at different temperatures as well as CPU temperature output. AMD only recommends a temperature to the motherboard manufacturer, the bios writer ultimately decides at exactly what temperature this should occur. In most Asus motherboards and AMD processors, I've taken notice that 65c was a throttle temperature at the Cpu socket temp and the core temp never makes a throttle but will occur a thermal shut down.
Since my processor is de-lidded, I have an easier time getting my board to shut off via core temps, usually between 85 and 90c while I have seen 82.5c with a running benchmark and 5200mhz pushing up 1.6000v and beyond meanwhile my Cpu socket temp would remain in the late 40c range seldom reaching in the low 50c range and this also does rely on ambient temps which play a very important role in cooling.