If you go here: http://shop.lenovo.com/gb/en/laptops/thinkpad/x-series/x250/#tab-customize http://shop.lenovo.com/gb/en/laptops/thinkpad/x-series/x250/... You

If you go here: http://shop.lenovo.com/gb/en/laptops/thinkpad/x-series/x250/#tab-customize 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.