Well, OTES fans are to supplement the "Fanless" cooling system that's included on the motherboard. You can read the OTES overview HERE. You have to buy specific fans to use on your OTES. Check item #9 on this page HERE if you want to buy them. Also, the BIOS settings referring to the OTES optional fans is on page 3-7 and 3-8 of the User Manual which you can download directly from this link HERE. Hopefully, this will help you out!
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