Question about be quiet! Pure Rock 2 FX

Yes, you can use the CPU cooler with an AMD Ryzen 7 5800X. The cooler is compatible with the AM4 socket on which the Ryzen 7 5800X runs. It offers a cooling capacity of up to 150W, which is sufficient for the processor's TDP of 125W. However, it may be necessary to adjust the fan speed for very demanding workloads in order to achieve optimum performance and noise levels.