On 1/26/2023 5:00 PM, Chris Angelico wrote: > On Fri, 27 Jan 2023 at 06:54, Thomas Passin <email@example.com> wrote:
>>> Did you get a warning, or did you just decide to stop the test?
>> (At least) one of the utilities, I forget which one, did show the
>> temperature in a danger zone.
> I'm very curious as to which utility, and on what basis it called it
> "danger". Notably, whether there's any sort of actual manufacturer
> threshold that that was based on.
1. we're talking maybe a dozen years ago, I don't remember every detail
about wordings. Coretemp e.g., gives clear warnings (though at what I
think are lower temperatures than necessary).
2. "What is Tjunction max temperature?"
Tjunction max is the maximum thermal junction temperature that a
processor will allow prior to using internal thermal control mechanisms
to reduce power and limit temperature. Activation of the processor's
thermal control system may cause performance loss as the processor
typically reduces frequency and power to prevent overheating. The
maximum junction temperature limit varies per product and usually is
between 100°C-110°C." https://www.intel.com/content/www/us/en/support/articles/000005597/processors.html
The utilities I used always stated a 100 deg limit for Tj.
3. "Is it bad if my processor frequently approaches or reaches its
Not necessarily. Many Intel® processors make use of Intel® Turbo Boost
Technology, which allows them to operate at very high frequency for a
short amount of time. When the processor is operating at or near its
maximum frequency it's possible for the temperature to climb very
rapidly and quickly reach its maximum temperature. In sustained
workloads, it's possible the processor will operate at or near its
maximum temperature limit. Being at maximum temperature while running a
workload isn't necessarily cause for concern. Intel processors
constantly monitor their temperature and can very rapidly adjust their
frequency and power consumption to prevent overheating and damage."
But automatic throttling wasn't common back when I first noticed the
heating issue. > Personally? Very dubious. Your entire premise is "five degrees MUST be
> a problem", without any visible basis.
Bridges are built with 150 - 200 % strength margin. This doesn't mean
you should deliberately overload one.
Heat is the enemy of electronics - a very old lesson. Tj =~ 100 deg C
for CPUs, a familiar figure.
My premise, to use your word, is not what you say. It is to avoid
excessive heat if at all possible, and if the manufacturer says the max
junction temperature is 100 deg, I'm going to avoid approaching 100 deg
if possible - or to minimize the stay there. Most chemical effects are
exponentially sensitive to temperature and problems with semiconductors
are likely to be chemical - remember, e.g., the purple plague? A
So yes, checking with HWiNFO, my current system is throttling and power
limiting during this particular test. That's good. And I'm still going
to stay away from the highest temperatures when possible.