Like in the title. I've recently upgraded from RC to RTM (basically I've done clean install on one laptop and upgrade on the other). Both laptops became hotter. Did anyone noticed similar behavior? Did Microsoft brake CPU power management?

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Check your opened process, with for example Process Explorer.

Since you are on a laptop, the CPU is most likely dynamically switching frequency, to save power and heat generation. If you have a process making a constant activity on the CPU, it will cause it to stay in the higher frequency, causing more heat.

I don't think that switching from RC to RTM did this precisely, but maybe there is a process installed, making this.

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Actualy dwm (Desktop Window Manager) was using around 8% (more than any other process) of cpu (core 2 duo 2.2). Then I've realized that yesterday I was playing with unsupported win7 themes, and I was patching some things. This might be the issue. Anyway I've set back the changes and dwm seems to calm down. We will see if this have helped. – kyrisu Sep 2 '09 at 12:13
This solved it - after all it was my fault. To much playing with the system :) – kyrisu Sep 4 '09 at 13:13
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You might want to take a look at the following website: http://www.blackviper.com/Windows_7/servicecfg.htm

It outlines the Windows 7 services, and the configurations recommended to use with them. The website also has a link to the RC1 services, which you can compare with the ones listed for the RTM.

Regardless, if you wish to have your CPU use less cycles (and therefore generate less heat) while idling, I recommend you at least take a look at the guide - I'm sure you'll find at least one service which you don't require, which at the very least, will free up some RAM.

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My heat emissions are at normal levels. Possibly consider doing a bios update?

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