ive had my system for a lil over a year now, and i recently noticed that my cpu has been running about 10 degrees C hotter than usual (its a 1.2 ghz athlon thunderbird, running at stock settings). it used to run great at 55 degrees maximum heat, but now for some reason its running at 65 and i dont know why. my fans are all still running perfectly fine, and i even re-applied the heat sink and added some thermal grease, which did bring it back down to 55, but a few days later i check it again and its back to 65. the heatsink i have is a Tai Sol CGK760092, with a sanyo denki fan (not sure exactly which one). anyone have any idea why this could be happening, and what i should do about it?