Last night I swapped out my rig from an old chassis (Zalman Z9 Neo White) and put it into a new one (NZXT S340 Elite). Everything is working accordingly, but the only problem is the two radiator fans (Noctua SS02 NF-F12 iPPC 3000 PWM) are running at a constant 2880 RPM (even with PWM enabled in bios), which is ridiculously loud. In my old chassis, the fans never ran this high. All the cables are connected like they were when my rig was in the previous case. I don't know what the problem is. I can't control the fans at all with Corsair Link. The only way to turn down the noise significantly is to change the CPU fan back to QFAN in bios.
Asus X-99A/USB 3.1
i7-5820k OC @ 4.2Ghz/1.1v
Corsair H100iV2 with 2x Noctua SS02 NF-F12 iPPC 3000 PWM
GTX 1080 Ti FE OC (+150 core/+500 Memory)
16GB DDR4 2400
PNY 240GB SSD
WD 1TB 7200 RPM HDD
WD 3TB 5400 RPM HDD
EVGA SuperNOVA 1000W T2 80+ Titanium
If the fans are connected to a motherboard header, control them with the ASUS motherboard software (AI Suite), not 3rd party software, start with Auto fan tuning.