Lenovo SYSTEM BOARDS
5B21D53557
is compatible in the following Models:
Lenovo ThinkPad P Series laptops
ThinkPad P1 Gen 4 (20Y3, 20Y4 ) Laptop - 20Y3CTO1WW
ThinkPad P1 Gen 4 (20Y3, 20Y4 ) Laptop - 20Y4S32F00