Lenovo 63Y171B | System Board (Motherboard) for ThinkPad T420s

1. Brand: Lenovo
2. Model: 63Y171B
3. Compatible with: ThinkPad T420s
4. Chipset: Intel QM67 Express
5. Processor socket: Socket G2
6. Memory type: DDR3 SDRAM
7. Memory slots: 2
8. Maximum memory supported: 8GB
9. Graphics card type: Integrated Intel HD Graphics 3000
10. Audio: Integrated High Definition Audio
11. Expansion slots: ExpressCard/34 slot, Smart Card reader
12. Ports: 3 x USB 2.0, VGA, DisplayPort, Ethernet, Audio ports

Notes:
1. The motherboard is not compatible with other ThinkPad models.
2. The ExpressCard/34 slot allows for expansion of the laptop's capabilities.
3. The Smart Card reader provides an extra layer of security for the laptop.