Can somebody help explain this to me? When I originally built my i5 4670K PC, it would idle at 28-35 degrees. Now I'm idling at a steady [b]40 degrees[/b], with bumps being as high as [b]44[/b] to even [b]50 degrees[/b]. I'm not overclocking, though I previously was, but since I had some issues and refused to increase voltage, I simply reset my BIOS and just clocked the RAM to the packaging specifications since "automatic" made it go slower than its intended speed. Certainly it can't be this though. I haven't had any bluescreens like I was getting once in a while with the 4.2 GHz overclock with no voltage increase.
What's going on here? Am I going to have to reapply the thermal paste?
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Make sure you don't have any dust in your heatsink. I had a similar problem and I just had to use a blow drier to clear out any dust in the fins. If that doesn't work, try reapplying your thermal paste.
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How high did the temperature get under load? If it didn't get higher than 50ºish, I wouldn't worry too much. 25º can be a little low for some builds, so perhaps it was trying to compensate?
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Dust on components? Slightly slower fan speed? Hotter air in surroundings? All of these things can affect the rate of heat transfer.
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Maybe your fan is failing or your paste is failing, either way get a new fan and try again.