You can upgrade upto 8GB with 0MB non-removable base memory and 2 memory slots
Machine name: Lenovo-IBM ThinkPad X201
CPU options: Intel Core i5 Processor
Chipset: Intel QM57 Chipset
HD Bus: SATA 2.5"
Front Side Bus options:
Memory Speed options: PC3-8500 DDR3-1066 204pin SDRAM SODIMM
- Mfgr's System p/n's: 3249-xxx; 3626-xxx; 3680-xxx
- Maximum configurations require a 64-bit operating system.
- This machine supports maximum memory upto 8GB (using 64-bit Operating System) or 4GB (using 32-bit Operating System).
Maybe this can help
www.memoryx.net/x201ddr31066.html