6 ms·
> CPUs now throttle to keep their temp in check. Back then, if the temp got too high they’d be permanently damaged like in the example above. Well, it kinda de
by to11mtm 24d ago
> CPUs now throttle to keep their temp in check. Back then, if the temp got too high they’d be permanently damaged like in the example above.
Well, it kinda depended on the CPU. And then sometimes the motherboard.
On the Intel side, P3s had a pin on Socket 370 to signal an immediate halt/shutdown. You could probably still damage the CPU, and I'm willing to bet a lot of the cheaper motherboards wouldn't respect it. But plenty did, since S370 needed other changes to support Coppermine anyway.
On the AMD Side, Athlon XPs and Morgan Durons did add a safety mechanism similar to the Pentium 3, but since the Thunderbird and Spitfire Durons did not, it was far far less supported.
- userbinator 24d agoIntel had THERMTRIP since the Pentium II (slot 1). This is an output signal, and didn't need any mobo involvement; the CPU automatically shuts down and stays stopped until reset with the temperature below the limit.
- rasz 23d ago>THERMTRIP And this wasnt the only mechanism. Before THERMTRIP# triggers there is also diode based temp sensor embedded in later CPUs (THERMDP, THERMDN) Mobo designer can use to trigger either STPCLK# directly Pentium® III Processor Active Thermal Management Techniques http://notes-application.abcelectronique.com/027/27-46150.pdf http://notes-application.abcelectronique.com/027/27-46150.pd... or southbridge THRM# pin which in turn actuates build-in ACPI interface with programmable Thermal Duty Cycle CPU throttling (THRM_DTY using STPCLK#) in 12.5% steps (6% steps in later revisions of ACPI interface). 82371AB PCI-TO-ISA / IDE XCELERATOR (PIIX4) datasheet https://theretroweb.com/chip/documentation/29056201-64f6fb6fe8db4631654578.pdf#page=205 https://theretroweb.com/chip/documentation/29056201-64f6fb6f... AMD didnt have thermal sensor on CPU Die in early CPUs, they had an app note requiring Mobo makers integrate external sensor under socket. No one bothered, not even good brands like Siemens, and we got famous Toms Hardware article with video of AMD CPU burning into a crisp after taking off radiator on Siemens mobo.
- to11mtm 21d agoHuh! Didn't realize P2 had THERMTRIP. Thanks for the correction!