Can I/how can I install more RAM on a ThinkPad X200?

Solution
Pg 48 of the same users manual states:

Optional memoryv
512-MB DDR3-1066 SDRAM SO-DIMM (PC3-8500) card × 1
1-GB DDR3-1066 SDRAM SO-DIMM (PC3-8500) card × 1
2-GB DDR3-1066 SDRAM SO-DIMM (PC3-8500) card × 1
(maximum of 4.0 GB)

Doesn't look like you can get 8GB.

-Wolf sends

MCMunroe

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So it can have 8GB? Even if not, it can have 6GB?