On Thursday 29 January 2004 02:52 pm, John Richard Smith wrote:
> However this is going to shock you. AMD appear to sanction a
> maximum die temperature of 90 C, yes I repeat 90C, I know, how
> can anything electrical survive at 90C, beats me and I would
> never allow that on principle, but judge for yourself.
>
> John
No shock at all. Your CPU is probly AMD spec'd to fail at
95C. Newer AMD's and even P4's, at 100C and higher. Newest
Intel's as high as 110C. High Ghz comes at the price of high
wattage and it's resulting high heat dissipation. The die's are
designed and fabbed with this in mind.
When the say fail.... they mean *fried*. Also, electronic
components aren't like iron skillets. They're internal core
temps (and that is what is spec'd) change up and down almost
instantly, sometimes drastically. You don't see this in bios, or
in lm_sensors, because the SMBus/i2c is sampled at intervals.
Processors of the last few years will go from room temp to
failure in a few seconds, if the heatsink and fan are removed or
improperly installed/functioning. The newest processors even
quicker.
Back to the core temp spec, I stress that's the internal
core temp. With an AMD chip, particularly one as old as yours,
the CPU temp is gathered from a probe. Either from a contact
thermistor, or read from a CPU pin (how hot the pin is). From a
pin is a little more accurate, but that is the temp you see in
bios and what lm_sensors reads. AMD specs that from 10C to 20C
should be added to this probe temp to approximate the internal
core temp.
Now for your 1800+, I'd say you never want to see 60C probe
temps. High 40's to low 50's would be normal under extreme load.
If you do reach 60C or over, and your CPU has sustained that temp
a few too many times in the past, the internal traces have
weakened and become more resistant. The CPU will need more
voltage (which further aggravates the heat situation), and will
have become even less tolerant of high internal temps. Often, the
only thing to do if you continue to use it, is to underclock.
Which is what you're doin usin a 100Mhz FSB. Even then,
reliability can be very iffy.
--
Tom Brinkman Corpus Christi, Texas
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Go to http://www.mandrakestore.com
