Have a look at the specs of the motherboard:
https://www.asrock.com/MB/AMD/B450M Pro4-F/index.de.asp#Specification
- 1 x RGB LED Header*
- 1 x Addressable LED Header**
- 1 x AMD Fan LED Header***
- 1 x CPU Fan Connector (4-pin)****
- 1 x Chassis Fan Connector (4-pin) (Smart Fan Speed Control)*
- 1 x Chassis Fan Connector (3-pin)
*Supports in total up to 12V/3A, 36W LED Strip (dumb RGB, needs a dedicated controller)
**Supports in total up to 5V/3A, 15W LED Strip (addressable means the motherboard can control the RGB)
***The AMD Fan LED Header supports LED strips of maximum load of 3A (36W) and length up to 2.5M.
****The CPU/Chassis Fan Connector supports the CPU fan of maximum 1A (12W) fan power.
(dedicated RGB controller needed)
*CHA_FAN1 can auto detect if 3-pin (voltage regulated fan) or 4-pin fan (PWM fan) is in use. (dedicated RGB controller needed)