Temp Difference on-die and under-cpu sensors

[Guest]

Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

I've just got an A7V880 and the cpu temp is read from under the socket.
There's no little tape reaching up. My Biostar read the sensor in the cpu.

How much cooler should the under-cpu sensor read than the on-die sensor?

I'm having voltage reading issues, so don't trust the temp reading, and am
trying to establish some sort of ratio.


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[augustus]

Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

"Ed Light" <nobody@nobody.there> wrote in message
news:v_63d.274119$Lj.134746@fed1read03...
> I've just got an A7V880 and the cpu temp is read from under the socket.
> There's no little tape reaching up. My Biostar read the sensor in the cpu.
>
> How much cooler should the under-cpu sensor read than the on-die sensor?
>
> I'm having voltage reading issues, so don't trust the temp reading, and am
> trying to establish some sort of ratio.

My Soltek board monitors both....on my Barton 2500 @ 2205Mhz at idle it's
39-40C external CPU diode, 45C internal CPU diode. Under heavy load, they're
both up by about 6-7C, and they're still 5-6 degrees apart.

 

[Guest]

Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

"Ed Light" <nobody@nobody.there> wrote in message
news:v_63d.274119$Lj.134746@fed1read03...
> I've just got an A7V880 and the cpu temp is read from under the socket.
> There's no little tape reaching up. My Biostar read the sensor in the cpu.
>
> How much cooler should the under-cpu sensor read than the on-die sensor?
>
> I'm having voltage reading issues, so don't trust the temp reading, and am
> trying to establish some sort of ratio.
>

It's really impossible to say because the reading from the socket diode is
adjusted via a algorithm to approximate on die temperature. If the
adjustment applied is perfect there will be zeo difference between socket
and die temps, however it's rarely perfect.

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[augustus]

Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

> It's really impossible to say because the reading from the socket diode is
> adjusted via a algorithm to approximate on die temperature. If the
> adjustment applied is perfect there will be zeo difference between socket
> and die temps, however it's rarely perfect.

Do you have any link or other info to back this assertion up. Not the part
about the adjustment algorithm, but the part that it's supposed to
compensate for and approximate internal CPU diode temp. Is it not supposed
to give CPU external surface temp?

 

[Guest]

Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

"BigBadger" <big_badger@NOSPAM.com> wrote in message
news:cij9gn$rvd$1@newsg4.svr.pol.co.uk...
> "Ed Light" <nobody@nobody.there> wrote in message
> news:v_63d.274119$Lj.134746@fed1read03...
>> I've just got an A7V880 and the cpu temp is read from under the socket.
>> There's no little tape reaching up. My Biostar read the sensor in the
>> cpu.
>>
>> How much cooler should the under-cpu sensor read than the on-die sensor?
>>
>> I'm having voltage reading issues, so don't trust the temp reading, and
>> am
>> trying to establish some sort of ratio.
>>
>
> It's really impossible to say because the reading from the socket diode is
> adjusted via a algorithm to approximate on die temperature. If the
> adjustment applied is perfect there will be zeo difference between socket
> and die temps, however it's rarely perfect.
>

Oops...should have said socket 'Thermister'
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[Guest]

Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

"Augustus" <augustus@wrtt.net> wrote in message
news:bai3d.25430$yW6.1262@clgrps12...
>> It's really impossible to say because the reading from the socket diode
>> is adjusted via a algorithm to approximate on die temperature. If the
>> adjustment applied is perfect there will be zeo difference between socket
>> and die temps, however it's rarely perfect.
>
> Do you have any link or other info to back this assertion up. Not the part
> about the adjustment algorithm, but the part that it's supposed to
> compensate for and approximate internal CPU diode temp. Is it not supposed
> to give CPU external surface temp?
>
Internal CPU diode or CPU core external temp, the two should be pretty
close. It does not really matter which the algorithm tries to emulate. The
point I tried to make, is the socket thermister reading is adjusted,
therefore without knowing the exact nature of the adjustment it's impossible
to say what the relationship between internal diode and socket thermister
temperatures is.
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