Are you sure? All my searches led me to 8GB max.
EDIT: aha, seems like a company called Intelligent Memory makes a single 16GB module [1] that works with X250.
[1]: http://forum.notebookreview.com/threads/now-16gb-ddr3-module...
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If you go here: http://shop.lenovo.com/gb/en/laptops/thinkpad/x-series/x250/...
You can select a 16Gb option for the X250. It does say "single SODIMM" though, which presumably means single channel memory => a very expensive SODIMM & sub-par performance compared to a dual channel equivalent.
That doesn't seem available in all stores. The 16GB option is not available on the US store.