No solder required.
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Their reason for soldering ram is not usually about space.
As far as I know, it’s about access times between the RAM and CPU. It’s the same reason SoCs are having RAM integrated.
It’s about cost, space, heat and most of all “MONEY”
If I force you to buy the extra ram upfront because you can’t upgrade it, I can charge a premium for it.
I’ve never had to solder laptop ram. I always buy ones that let me get in there without a complete disassembly.