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I like to slightly under-clock my processor to keep it cool. I use the following setting :
enter image description here
But while playing games(usually for 4-5 minutes) the settings automatically jump back to 100%. enter image description here
I have also tried making a new power plan but same thing happens. My processor is Amd anthlon X2 4600(2.4 GHz) and OS is Windows 7.

Why is processor state automatically changing and how to prevent it ?

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Try using the Power Saver profile. –  James Jul 6 '12 at 12:54
    
@James Tried that already. Same behavior, both processor sates jumping back to 100%. –  Serious Jul 6 '12 at 13:03
1  
Do you have the Catalyst control centre installed? Try closing it. Someone else had a similar problem: vistaheads.com/forums/… –  James Jul 6 '12 at 13:17
    
@James It is working for now. Please post it as an answer. –  Serious Jul 6 '12 at 14:18

2 Answers 2

up vote 0 down vote accepted

Somebody else reported a similar issue and it seems that it was caused by the ATI/AMD Catalyst Control Panel. Closing it and removing it from startup might fix the problem.

Source: http://www.vistaheads.com/forums/microsoft-public-windows-vista-performance-maintenance/180652-power-options-keeps-resetting-upon-startup.html

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Thanks. This fixed the problem, but I don't understand why all of a sudden catalyst started causing problem. –  Serious Jul 8 '12 at 15:20

Im not really sure, but I think that means that's using the 100% of the 85% of your assigned processing power.

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+1 for that; if these settings are configured in BIOS then Windows might not know they exist. –  jackweirdy Jul 6 '12 at 12:43
    
@Rhyuk I think you have misunderstood . I am not taking about processor usage. I have made it clearer now. please re-read. –  Serious Jul 6 '12 at 12:58
    
@jackweirdy Cool and quite is enabled in BIOS so the processor can run at different states. Btw the settings were working fine till now. –  Serious Jul 6 '12 at 13:01
    
My bad, work firewall is blocking images. Thought this was BIOS configured. –  Rhyuk Jul 6 '12 at 13:36

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