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The memory is soldered in to save space, yes. That also means it is not aftermarket upgradeable.

But still, they could have soldered 32 gb on.

It's a CPU limitation when used with LPDDR3 modules. See http://www.intel.com/content/www/us/en/processors/core/7th-g... (See section 2.1.1.3, "LPDDR3 supported memory devices")

Memory is soldered, but they could have had a 32gb option regardless -- they still have the 8gb option after all.

The real limitation IMHO is power: to chase thinness, they reduced the battery volume and went for all the low-power options they could find. 32gb would likely not be low-power.

As far as I know, yes the memory is soldered in.