Lenovo SYSTEM BOARDS
5B21K90391
is compatible in the following Models:
Lenovo ThinkPad X Series laptops
ThinkPad X1 Carbon 10th Gen (21CB 21CC) Laptop - 21CBCT01WW
ThinkPad X1 Carbon 10th Gen (21CB 21CC) Laptop - 21CBCTO1WWAU6
ThinkPad X1 Carbon 10th Gen (21CB 21CC) Laptop - 21CBCTO1WWAU8
ThinkPad X1 Carbon 10th Gen (21CB 21CC) Laptop - 21CBCTO1WWAU9
ThinkPad X1 Carbon 10th Gen (21CB 21CC) Laptop - 21CBCTO1WWUS1