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a discrepancy on Pentium 4 Shuttle XPC

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a discrepancy on Pentium 4 Shuttle XPC

Postby tr888 » Tue Nov 08, 2011 1:49 pm

I just downloaded CoreTemp 1.0. I plan to use it on a new PC running Windows 7 x64 with an i5-2500 CPU, but am trying it out on an older PC with a Pentium 4 running XP SP3.
The PC is a Shuttle XPC. Shuttle has a fan-control and overclocking utility called XPC Tools. I am not overclocking but use XPC Tools to control the fans.

XPC Tools reports on "System Temp" and "CPU Temp".
System Temp=41C.
CPU Temp=44C at idle and spikes to around 56C when I move this forum window rapidly around the screen (in Chrome browser). CPU Cooler fan is set to kick into overdrive at 55C, and it does kick into overdrive.

However, Core Temp reports no change in Core temperature when I move the window arouund. Its Core #0 reading stays at 41C. It seems Core Temp's Core #0 reading matches the XPC Tools "System Temp" reading, not its CPU Temp reading. I don't know which is correct. Is it possible that Core Temp is reading the wrong value?

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Re: a discrepancy on Pentium 4 Shuttle XPC

Postby The Coolest » Sun Feb 12, 2012 11:36 am

Core Temp does not natively support Pentium4 CPUs, as they do not have the required built in thermal sensors for Core Temp to read.
In such a case, Core Temp tries to access a standard temperature reading, the ACPI temperature.
When properly implemented, it should display the same temperature you see in CPU temp in the XPC software, but when it's not, what you usually get is a static value that never changes. Some systems do not have ACPI thermalzones implemented at all, in which case you get a reading of 0C (?).
On anything based on the Core architecture (Core 2, Core i3/5/7) will work fine with Core Temp since they already implement the necessary sensors.
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