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AMD CPU's MAX TEMPS! - Page 17

post #161 of 428
Quote:
Originally Posted by yuksel911 View Post

It's 61'C for core on your 8150!

From http://support.amd.com/us/Processor_TechDocs/41256.pdf: "2.10.1 The Tctl Temperature Scale
Tctl is the processor temperature control value, used by the platform to control its cooling systems. Tctl is
accessible through SB-TSI and F3xA4[CurTmp]. Tctl is a non-physical temperature on an arbitrary scale measured in degrees. It does not represent an actual physical temperature like die or case temperature. Instead, it
specifies the processor temperature relative to the point at which the system must supply the maximum cooling
for the processor’s specified maximum case temperature and maximum thermal power dissipation. It is defined
as follows for all parts:"
...
"The default value of the HTC temperature threshold (Tctl_max) is specified in the Power and Thermal
Datasheet."

From the datasheet (http://support.amd.com/us/Processor_TechDocs/43375.pdf):
"2. Tctl Max (maximum control temperature) is a non-physical temperature on an arbitrary scale that can be
used for system thermal management policies. Refer to the BIOS and Kernel Developer’s Guide (BKDG)
for AMD Family 10h Processors, order# 31116."
and then it says "Tctl Max 70 oC" for every CPU.
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post #162 of 428
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post #163 of 428
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post #164 of 428
just curious has anyone actually ever killed a processor from heat? My phenom II 830@3.5ghz runs 65 Celsius under linepack load . I know its not the same but I have ran my q6600@3.6ghz 74 Celsius under line pack load. Its has ran that way for 4 years with no noticeable effects.
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post #165 of 428
I don't think you can -- at least not acutely. Maybe long term through electromigration or diffusion changes.
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post #166 of 428
I killed a northwood P4 with temps. The hsf fan died while I was out and it ran at 90-100c for awhile. The chip still posts, but locks up after the memory tests at any speed.
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post #167 of 428
Northwood p4s were known for electromigration i think. But, i have really never seen any stories regaurding modern processors having that problem. I am not understanding what all the fuss is about with people setting these tempurature ultimatums "has to be under xx degrees or else". So what if the processor dies in 5 years instead of 10. Wouldn't you just run it as fast and as hot as it will run stable?
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post #168 of 428
P4 northwood only had an issue over 1.7v, Mine was at 1.55-1.6. It definitely the heat that killed it, sustaining anything over 80c is dangerous as the backfill material under the die will soften causing the solder joints to fail. This is what got Nvidia in trouble with their laptop chips a few years back.

Their backfill material was only rated for ~90c and the chips were running at ~80c. Now the backfill is rated for 100-110c which is good up to 90c for continuous use without too much reduction in lifespan (3-4 years). But seeing as people upgrade GPU's often, this is seen as acceptable. CPU's are designed to last much longer due to server hardware using them, thus the 20-30c gap in rated backfill temp and recommended temp (as opposed to GPU's which run 15-20c from rated temp).

Electromigration is the phenomenon that causes the circuits to literally erode due to current moving through them. Think of a river moving dirt and mud downstream, it gets worse with more current moving through a smaller space. (regardless of temps)
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post #169 of 428
My CPU (4ghz) hit 56C after 2 hours of prime 95,
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post #170 of 428
My 1055T now 1 years old and 3 months....

It's been over 62C under load, even overheated at the point where it hit the thermal shutoff "W/C pump power cables were unplugged :/"

Been under (1.55V Max Safe Voltage) 1.6V - 1.8V and even 2.0V

And it still rocks at 4.0GHz fine, I tend to keep it at 3.8GHz though.

People sometimes underestimate the life expectancy of there CPU's *Smacks head*
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