Thermal protection

[XModem]

I read that the Intel chips now have thermal protection, ie, they will
shut down if the die temperature reaches a fixed point, as would happen if the
heatsink fell off, etc.

Do any AMD chips feature thermal protection now?

 

[Wes Newell]

I read that the Intel chips now have thermal protection, ie, they will
shut down if the die temperature reaches a fixed point, as would happen if
the heatsink fell off, etc.

Do any AMD chips feature thermal protection now?

The K8's do. The K7's don't.

 

[Hellraiser]

The K8's do. The K7's don't.

However the XPs have an internal thermal diode which passes readings to the
motherboard - most recent motherboards have their own thermal protection
which will kill the power to the CPU in the event of a rapid rise in
temperature.

Hellraiser.............>

 

[XModem]

However the XPs have an internal thermal diode which passes readings to the
motherboard - most recent motherboards have their own thermal protection
which will kill the power to the CPU in the event of a rapid rise in
temperature.

Hellraiser.............>

Thanks to you both for the info. Looks like a nice safety improvement over my
T-Bird.

 

[Wes Newell]

Thanks to you both for the info. Looks like a nice safety improvement
over my T-Bird.

Don't be fooled by hellraisers remarks. An XP is just as likely to fry as
your tbird. There's been many that have for one reason or another. It
won't happen with a K8, as it does it itself and doesn't rely on a MB bios
and temp sensor to do it.

 

[Ed]

Don't be fooled by hellraisers remarks. An XP is just as likely to fry as
your tbird. There's been many that have for one reason or another. It
won't happen with a K8, as it does it itself and doesn't rely on a MB bios
and temp sensor to do it.

I've turned on my ASUS A7N8X with Barton 2800+ a couple times without a
heat sink on the CPU, all it did was beep and shutdown, been running for
about 3 years now, no problems.

Ed - $0.02

 

[XModem]

Don't be fooled by hellraisers remarks. An XP is just as likely to fry as
your tbird. There's been many that have for one reason or another. It
won't happen with a K8, as it does it itself and doesn't rely on a MB bios
and temp sensor to do it.

Forgive my ignorance, but I've been away from the processor scene for a while
- what is the K8? Did a quick look on the AMD site, and I guess I missed it.
Does it go by another name?

 

[Wes Newell]

I've turned on my ASUS A7N8X with Barton 2800+ a couple times without a
heat sink on the CPU, all it did was beep and shutdown, been running for
about 3 years now, no problems.

Ed - $0.02

Congrats ok, now while you're running at 100% cpu usage, open the side
cover and remove the cpu cooler.

The K7 doesn't have overheat protection itself, and it's likely to fry
your cpu before the MB shuts down the system, if it even does. Just
because you had the fan detection turned on in the bios of your board
won't do much for you in this case.

 

[Wes Newell]

Forgive my ignorance, but I've been away from the processor scene for a
while - what is the K8? Did a quick look on the AMD site, and I guess I
missed it. Does it go by another name?

Athlon 64, non socket A Semprons, Opterons. Socket 754, 940, and 939 cpu's
probably covers ity better. Some to add socket M2.

 

[Ed Light]

I don't think K8's have on-chip protection. Just a thermal sensor the
motherboard can use. They aren't supposed to hit 70C and people have taken
them up there.


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[Wes Newell]

I don't think K8's have on-chip protection. Just a thermal sensor the
motherboard can use. They aren't supposed to hit 70C and people have taken
them up there.

I'm not sure what you're saying here, but they have independent thermal
protection. The MB plays no part in it. If the internal sensor reaches
it's limit, the cpu shuts itself down without any external help. If ones
monitoring software has surpassed the limit of the cpu, then they can be
sure that the monitoring software is not correct.

 

[Ed Light]

I'm not sure what you're saying here, but they have independent thermal
protection. The MB plays no part in it. If the internal sensor reaches
it's limit, the cpu shuts itself down without any external help. If ones
monitoring software has surpassed the limit of the cpu, then they can be
sure that the monitoring software is not correct.

What's the built-in limit?


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[Wes Newell]

What's the built-in limit?

Depends on the core. And I'm not sure what it is for each. I'd guess
somewhere between 70-95C. It might be in the model specs somewhere. I
think this is how it works, but don't hold me to it.

Thermtrip (Thermtp) Bit 1. Set to 1 if a temperature sensor trip occurs
and was enabled.

Thermtrip Sense (ThermtpSense) Bit 3. Set to 1 if a temperature sensor
trip occurs. The value of this bit is maintained through warm reset.

Thermtrip Enabled (ThermtpEn) Bit 5. Indicates that the thermtrip
temperature sensor is enabled. When this bit is set to 1, a THERMTRIP High
event will cause the hardware to shut down the PLL, assert the THERMTRIP
output pin and set the ThermtpHi bit. The ThermtpSense bit is set for a
THERMTRIP High event, irrespective of the state of ThermtpEn.

Diode Offset (DiodeOffset[5:0]) Bits 13-8.Thermal diode offset is used
to correct temperature measurement made by an external temperature sensor.
The offset is in 1 degree Celsius increments and it should be subtracted
from the temperature measurement. A correction to the offset may be needed
for some temperature sensors. Contact the temperature sensor vendor to
determine whether an offset correction is needed. The maximum allowable
offset is provided in the appropriate processor data sheet, and the
maximum offset can vary for different processors.

Software Thermtrip (SwThermtp) Bit 31. Writing a 1 to this bit position
induces a THERMTRIP event. This bit is write-only and returns 0 when read.
This is a diagnostic bit, and it should be used for testing purposes only.

 

[Ed Light]

What's the built-in limit?

Depends on the core. And I'm not sure what it is for each. I'd guess
somewhere between 70-95C. It might be in the model specs somewhere. I
think this is how it works, but don't hold me to it.

Thermtrip (Thermtp) Bit 1. Set to 1 if a temperature sensor trip occurs
and was enabled.

Thermtrip Sense (ThermtpSense) Bit 3. Set to 1 if a temperature sensor
trip occurs. The value of this bit is maintained through warm reset.

Thermtrip Enabled (ThermtpEn) Bit 5. Indicates that the thermtrip
temperature sensor is enabled. When this bit is set to 1, a THERMTRIP High
event will cause the hardware to shut down the PLL, assert the THERMTRIP
output pin and set the ThermtpHi bit. The ThermtpSense bit is set for a
THERMTRIP High event, irrespective of the state of ThermtpEn.

Diode Offset (DiodeOffset[5:0]) Bits 13-8.Thermal diode offset is used
to correct temperature measurement made by an external temperature sensor.
The offset is in 1 degree Celsius increments and it should be subtracted
from the temperature measurement. A correction to the offset may be needed
for some temperature sensors. Contact the temperature sensor vendor to
determine whether an offset correction is needed. The maximum allowable
offset is provided in the appropriate processor data sheet, and the
maximum offset can vary for different processors.

Software Thermtrip (SwThermtp) Bit 31. Writing a 1 to this bit position
induces a THERMTRIP event. This bit is write-only and returns 0 when read.
This is a diagnostic bit, and it should be used for testing purposes only.

Thanks for all that.


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