I just booted up a system I've built:
Antec P182, Gigabyte X48-DS4, Seasonic S12-550, 2 Noctua S12-1200 case fans and 1 Noctua P12 CPU fan on a Noctua NH-U12P heatsink
The two case fans are connected to the sys1 and sys2 fan headers on the motherboard (both 3-pin, no PWM), and the CPU fan...