Lenovo SYSTEM BOARDS 5B21L40814 is compatible in the following Models:

Lenovo IdeaPad S Series netbooks

Lenovo Slim Pro 9 16IRP8 - 83C00003US

Lenovo Yoga Series laptops (IdeaPad)

Yoga Pro 9 16IRP8 - 83BY000MAU

Yoga Pro 9 16IRP8 - 83BYCTO1WW