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CPU overheating after bios update

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Hi, i have a little problem with PC... CPU idle temp 35-36 celsius. Bios version F2. I decided update Bios to F4. After update CPU idles temp 45-49 celsius. Stress test shows 78 celsius after 20 secs... Before update was 60 degree... of course, before, after update and downgrade i loaded default bios settings. Now i'am with F2 BIOS nad everything looks good...

MB - GIGABYTE GA-EP35-DS3R (ver2.1)
CPU - Q6600 @3.2GHz
Cooler - OCZ Vendetta 2

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Could the update have changed a fan curve or something like that?

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Could the update have changed a fan curve or something like that?

Or it could've changed entire power states, if I even know what I'm talking about.

Or 'stock' voltages or something silly like that.

 

It could even just be reading the same values differently - but that would be really poor and I wouldn't expect that of BIOSes because surely at least some testing must go on before they push these packages.

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I changed thermal paste. With fan speed everything looks good. I looked around MB and temps looks normal... Heatsink is cold like ice :D

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