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"Unified" means that it's shared between CPU and GPU, I believe.

But yes, it tends to be soldered on.

No, but LPDDR means soldered, there are no LPDDR dimms

There's LPCAMM2, but it's very recent. The Framework Pro laptop supports it, for example, although only on the Intel variant.

I think unified RAM means soldered to the SoC, which is in turn soldered to the mainboard