The Thinkpad X250, T450, and T450s are all available with 16GB of RAM. The T450s maxes out at 20GB, and the T450 can theoretically support up to 32GB. The Dell Latitude E7450 is available in a 16GB configuration as well, but you must call and custom-order it. It's got a glossy screen, but the Chromebook Pixel LS has 16BG of RAM as well.