Check the size of the memory board by looking at the label or barcode of the chassis.

1. Check the label or barcode of the shell: If the label or barcode indicates that the memory of Raspberry Pie 4g is 4G or 8G, it can be determined to be 4G or 8G.

2. Check the size of the memory board: Because the memory board of Raspberry Pie 4B4G is composed of 5 12M multiplied by 8, and the memory board of 8G is composed of 1GB multiplied by 8, we can distinguish between 4G and 8G models according to the size of the memory board.