CPU_FAN and CPU_OPT are entirely different and serve distinct purposes in the context of a computer cooling system. CPU_FAN or CPU Fan Header is the primary 4-pin fan header on a motherboard, and it ...
How-To Geek on MSN
PSA: You need a rear fan on your PC
Unlike other case fans, the one in the rear isn't optional.
XDA Developers on MSN
Your motherboard's tiny fan header can do way more than cool your CPU
It's pretty cool, yanno?
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