Subj : Re: Overheating CPUs
To   : Barry Martin
From : Ky Moffet
Date : Fri Nov 06 2020 19:05:00

BARRY MARTIN wrote:
> Hi All!
> 
> No, I don't have a problem with an overheating processor, just couldn't
> think of a better title that fit. :)

Sufficiently generic to the topic. :)

> Saw this in the MythTV Users Forum this morning:
> 
>    When Intel chips overheat, the ramp down on CPU speeds, when AMD
>    overheats, they cut power.

In my experience it's "When Intel CPUs overheat, they throttle down (and 
will recover even if overheated to the point of seizing up); when AMD 
CPUs overheat, they fry and die." Cutting power is a definite 
improvement over croaking outright...

> Figured I'd post in case that bit of trivia helps someone.  ...The AMD
> CPU I have here overheated to the point it shut itself off even with the
> "AMD approved heatsink and fan" sitting on it.  Solved by installing a
> CoolerMaster Hyper 212 EVO.  Found out after the Cryorig CR-H7A is rated
> better and about a $5 difference in price.

The stock AMD heatsinks are crap. Every damn one I've ever seen is junk, 
and at best barely does the job. When I replaced Westworld's crappy 
stock heatsink with a solid copper heatsink with more fins and a bigger 
fan, its operating temperature went down about 20 degrees. (And the fan 
is much quieter.)

This'un, tho I only paid about $12 for it.

https://www.amazon.com/Adaptec-Socket-Heat-Sink-ACC-9520/dp/B000HRPHKE

Was so impressed I promptly bought another for the other AMD, tho the 
socket939 that it's supposed to also fit was just a little goofy and 
wouldn't seat right (and that board has since died, tho I have another 
that may eventually get it as an upgrade).

In fact, when I temporarily used a loose chunk of finned copper with NO 
fan (probably started life as a server heatsink), even that worked 
better than the stock aluminum AMD heatsink.

I've found AMDs have a more irregular surface than Intels, and 
absolutely require thermal grease (or a crush pad) to make good contact 
(conversely, Intels often don't need it). The cheap copper-based grease 
is the best I've found; with Intels you don't notice the difference so 
much, but with AMDs you can tell it's much better than the silver stuff.
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