The whole point in having dual connectivity on fans is to power them differently.
If you want the fan powered seperately from the mobo without the ability to control it via BIOS, then use the 4-pin molex, however, if you want the mobo to control it, use the 3-pin connector.
Do not use both at the same time, otherwise you could be severely reducing the life expectancy of the fan.




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I've tried all combinations of FSB straps and so on and am currently using BIOS 0901.
Intel i9 7900X @ 4.6GHz @ 1.126v
ASUS X299 TUF MARK 1
32GB G.Skill DDR4 2800
2x ZOTAC AMP EXTREME Core GTX1080Ti's in SLi
Loop 1: Apogee GTZ CPU block, MCR360 rad w/ Scythe fans, Micro-res, Aquaextreme 50Z pump
U2-UFO case 
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