Solved by Votivee, You can absolutely run 2 or 3 fans off of the same header on a motherboard with a splitter. The fans on the splitter will run at the same speeds. I would recommend using the same RPM fans if you can't use identical models. I have a Dark Rock Pro 4, and then 2 intake and one exhaust. My intake fans run on a splitter on the Based on Noctua's Standardised Perfomance Rating (NSPR), the NH-U12A is a better cooler than the NH-D15s. Here is the link. If you add a 2nd fan on NH-D15S , it almost matches the performance of the NH-D15. Neither can cool the power hungry 13900k.
Just bought a Noctua NH-D15 for my 5900X. Well worth it IMO My feeling is that nh-d15 is one of the less compelling air coolers to get because the value is a

NH-D15 is awesome. I have the same case as you the define r6 and when the case was stock temps were always very acceptable (for me). I have now upgraded/modified my R6 with the meshify S2 face and its even better. currently got HandBreak running converting movies. all cores @ 4.3ghz (ryzen master auto oc) 100% load and temps are fluctuating

Well worth the price. Just make sure it will fit in your case first ;) low profile RAM is a must. NOCTUA NH-D15 CPU Cooler 2x 140mm PWN Fans, 165mm Clearance

Lots of bashing on the two premium coolers lol. I have a Noctua D15S and it's great. Inaudible most of the time. But the absolute key thing is that top quality fans - like Noctua, BeQuiet, and the Phanteks T30 120 etc, make a noise at full power that's much less annoying than cheaper fans. Dnplk9.
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    • is the noctua nh d15 worth it