>> "could you tell me what hardware components are used for calculating the fingerprint?"
It depends on the machine, the operating system, the version, etc. In general: all the critical components: motherboard, CPU, RAM chips, primary hard disk, all real network adapters, etc.
Also, in general, real-world modification & upgrading of the computers will be fuzzy-matched with the old (switching out RAM, replacing hard drives, replacing non-critical copmonents like GPUs, etc.).