Sold Ryzen 7 5800X. fTPM. Should I worry about passkeys on it?

Sold Ryzen 7 5800X. fTPM. Should I worry about passkeys on it? Or will CPU not allow them to be leaked on new system?

As CPU change on a motherboard kills the passkeys, so I assume the passkey storage is either 2 factor (CPU + MB), or they are CPU bound or maybe 3 factor (CPU+MB+OS) or maybe CPU + OS? Where can i find this architectural documentation?