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 ...
XDA Developers on MSN
Your motherboard's tiny fan header can do way more than cool your CPU
It's pretty cool, yanno?
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.
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