CPU temperature under bootcamp with Windows 7

While watching youtube/flash or installing software (e.g. Adobe Acrobat updates), the CPU temperature on my new MBA 13" (1.7/4/256GB) goes pretty high, but ironically the fan speed does not increase to take care of that.

Attached is a screenshot I took using speccy, where we see that the CPU temperature is 94 C, but the fan speed is only 2001 RPM.

However, when I run OS X (Lion), the fan speeds up as necessary to accommodate the increase in CPU temperature.

Has anyone else experienced something like this? I did not put this under the "Windows on the Mac" section as I was not sure if this is something pertinent to MBA or all Macs.

Thanks!

Screenshot:

 

I don't have HWMonitor. I will try it and update here later. However, I am not sure if that's the case.

Thank you for this info.

You are right. On OS X, I see the fan speed and noise both increase as the CPU temperature crosses 70-75 C. However, on Windows (Bootcamp) I did not notice the same.

Usually in MBA, the fan noise increases a lot as its RPM increases (2K vs. 6K RPM). However, in this case I could barely hear the fan and that's why I think maybe the fan was actually running at 2K RPM.

 

Thank you for the link to resetting the SMC. I tried that, but did not notice any change. The surprising thing is that the CPU temperature and fan speed behave as it should when I am running Lion. This discrepancy is only observed in Windows 7 via bootcamp. Moreover in Windows 7, I also noticed that if the CPU is at 95+ C for a few minutes, then, the fan RPM slowly starts to increase (e.g. 2000, 2030, 2060, 2090, etc...) and after a few minutes it reaches till 4K+ and eventually brings the temperature down to approximately 80 C.

On the Lion side, the fan RPM reaches 4K+ as soon as the CPU hits 80+ C.

I think this is due to the bootcamp drivers, but that's just my guess.

Thank you for this information. I tried that and I was successfully able to disable the turbo mode. However, the system feels a little slow after I made that change. Also youtube (which I use a lot) became jerky at higher resolutions.

One of my reasons for buying the MBA (mid 2011 model) was the new turbo mode introduced in i5/i7 and hence I am a bit hesitant in disabling that. Having said that, I did notice a reduction in temperature by disabling the turbo mode, but I don't plan on keeping it that way, as youtube gets jerky : /

Thank you once again for the tip.

 

I mainly use Chrome and Firefox sometimes. I recently noticed that one of the reasons why youtube may get jerky at higher resolutions can be because I have an external display (1080p) connected to my MBA which I use as my primary display. I usually watch youtube on this external display and that's when they get jerky.

If I disable the MBA's display and only use the external one, then the videos get a little better.

However, in both cases (with or without MBA's internal display in use) the video gets a bit jerky if I disable the turbo mode.