B550 and Corsair 120 Argb coolers
B550 and Corsair 120 Argb coolers
You're facing a compatibility issue with your Corsair 120 Argb fans. It seems the 3-pin RGB connector isn't available on the motherboard, though the Jrainbow pins exist but are too long. You might need an adapter or consider if Corsair is pushing you toward their hubs.
Identify the Corsair ARGB fans and matching motherboards. Note that some Corsair ARGB fans aren't compatible with the built-in header, but they claim iCue compatibility on the packaging. If your model lists iCue compatibility, use Corsair's own hardware for ARGB to function properly.
B550 is merely an AM4 chipset, with many makers offering various versions. There are numerous fan models available, though choosing one can be simpler since Corsair fans with "iCue" labeling often use their specific connectors.