Yes, they require an NZXT controller for RGB control. The 4-pin PWM connector can be connected directly to the motherboard or an NZXT controller, but a compatible NZXT controller is required for RGB lighting.
For RGB control, you need to use an NZXT controller such as the RGB & Fan Controller, which requires a SATA and USB 2.0 connection to the motherboard. NZXT controllers support up to 6 RGB channels and 3 fan ports.