1, source: The inventory machine is the machine officially sold by Apple, while the resource machine is produced in the process of producing new machines on the production line, and then flows to the market through special channels.

2. Quality: The inventory machine is officially tested by Apple, and the quality is guaranteed, while the resource machine may be refurbished and heavily modified, and the quality is uneven.

3. Price: Due to the difference in source and quality of resource machines, their prices are usually cheaper than those of stock machines, but some unscrupulous manufacturers pretend to cheat and sell refurbished machines or cottage machines as resource machines to obtain higher profits.