i would definitely check into your internal temperatures. speccy and cpuid are two apps that monitor temperatures. speccy can be downloaded here in the download section. what i have seen multiple times is that fans get dusty and clogged and just don't move as much air as they should. Then what happens is that they speed up to move the same amount of air and reach the same effectiveness as they would if they were new and clean. your case fan is also called your system fan - the one that is blowing heat out of the back of your cabinet. that one is probably 92mm which is a standard case fan size for most oem PCs. have you looked at where the fans are plugged into? how many wires or pins do they connect with?
instead of buying new fans, you could attempt to clean your existing ones. and your CPU heatsink. That is what i had to do on my XP machine, because the pin configuration on my fans aren't standard and can't be replaced that easily, so i just removed them and cleaned them thoroughly. they still speed up from time to time, they aren't perfect, but they work fine.
most of the time, users encounter fan problems when they leave their PCs running 24/7 and the dust just keeps coming and coming, infiltrating the inside of the cabinets and wreaking havoc. with XP, you can just put the system on standby and the PC virtuallly shuts down, including fans, and can be brought back into functioning status with the press of the spacebar.
I have noted that sometimes users can use a regular house fan to move air around and spread out the heat as a temporary countermeasure. i would research the techniques for that before doing so. this subject has been discussed not too long ago, i will look for the topic .
Edited by synergy513, 07 November 2013 - 04:55 PM.