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Difference in temps between Win 7 (0.99.8) and XP (0.99.5)?

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Difference in temps between Win 7 (0.99.8) and XP (0.99.5)?

Postby Jabba » Mon Apr 18, 2011 2:52 pm

Hello all,

First of all, I have been a long time and happy user of Core Temp.

Recently i noticed something strange on one of my Lenovo ThinkPad X200. There seems to be a significant difference in measured temperatures on a X200 running Windows 7/Core Temp 0.99.8 compared with running Windows XP/Core Temp 0.99.5. I have several ThinkPad X200 2.4GHz P8600 in the family with the same specs, so I am able to compare.

Running XP and version 0.99.5 the idle temps (after idling 10 minutes) are very low - around 30-32 degrees celcius. This is typically running in low voltage mode at 800MHz or 2.4GHz undervolted. If running 2.4GHz at full voltage, the idle temps go up to around 35-37 degrees.

Running Windows 7 Ultimate (installed x86 on one X200 and x64 on another). The idle temps (again after about 10 minutes without CPU load) are at about 37-39 degrees celcius at 800MHz or 2.4GHz undervolted. If running 2.4GHz at full voltage, the idle temps go up to around 41-43 degrees.

All laptops are very clean and there is no dust buildup on the CPU fan or motherboard on any of the machines.

Is there an explanation behind this? Is it due to Windows 7 vs XP or due to the difference in Core Temp versions, that I am seeing an average idle temp difference of 7 degrees?
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Re: Difference in temps between Win 7 (0.99.8) and XP (0.99.

Postby The Coolest » Sat Apr 23, 2011 8:17 am

Well, every individual processor and laptop are not completely the same, even if they came off the same production line.
In Windows XP and Vista/7 temperature readings may be different (if it's the same machine) due to different power profiles/OS settings. Since Core Temp reads the values directly from the CPU, the OS cannot affect this value directly.
When you compare two different systems, even if they are both dust free, they are still probably in different states in regards of sensor calibration of the processor, thermal solution mounting and even the thermal compound state between the CPU and the heatsink.
There are simply too many variables.

My suggestion would be to compare the two versions on the same machine and see the results.
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