RAM Type: PC3-12800 DDR3L Min. RAM Speed: 1600 MHz
Details: Supports 1600 MHz PC3-12800 DDR3L SDRAM SO-DIMMs (204-pin).
Standard RAM: 4 GB Maximum RAM: 16 GB*
Details: 4 GB of RAM is installed as two 2 GB modules, no slots free.
*Apple officially supports a maximum of 8 GB of RAM, but third-parties have determined that this model actually is capable of using up to 16 GB of RAM with two 8 GB memory modules.
No, these computers don't have any soldered RAM, it's all user replaceable memory
It supports up to 8GB per each slot on the motherboard, and can max out at 16GB officially, the last generation MacBook Pro 15" maxed out at 8GB officially, this maxes at 16GB officially
This is a common confusion, because Apple only sells up to 8GB RAM, and most people assume the most memory Apple offers is the max, but this is not true, it goes up to 16GB