ThinkPad T420s

System Information

Manufacturer Specifications:

Memory Sockets: 2 slot(s)
Maximum Memory: Supports up to 8GB
Model Id: 4170-xxx, 4171-xxx, 4173-xxx, 4174-xxx

Product Notes:

If 4GB is installed, the recognized memory may be reduced to 3.5GB or less (depending on system configuration and memory allocation). 64-bit operating system required to support over 4GB.