16 gb stick will be double sided ram. May not work. 8gb are single sided, so it will work for sure.
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yes, that is true. Earlier laptops used to have problems with dual-rank modules.
But I don't think these issues have been present since later DDR3L-based laptops.
Are you sure, it may be laptop bios limitation or may be the ram will work but the system won't see more than 12gb total ram?
I don't think addressing the memory will be a problem. I have used 2*16GB DDR4 on an
i7-7700K-
Edit: i7-7700HQ based laptop and it worked without any problem. DIMMs were dual-rank and laptop supported dual-channel.
However, if both the soldered DIMM and the slot are interfaced to the same memory channel, then having three ranks (16GB will be dual-rank, soldered will be one rank) on one channel might be problematic (mostly due to the quality of laptop PCB).
If they are interfaced to different channels, then it is still dual-channel but without interleaving (utility software will not report dual-channel operation). No interleaving means the soldered DIMM and the slot DIMM have separate physical address spaces i.e. practically it's single-channel. You will see "dual-channel"-like benefits only when software(s) have been allocated pages from both DIMMs and are being accessed equally. Some memory controllers might interleave the amount equal to the smaller DIMM across channels, but these details are obscure.
Most laptops won't have this detailed info though so going by comments on amazon I think single channel ram is safer bet for older laptops(say 4th/5th gen or older). Your i7 7700k laptop was surely a rare & high-end model so I think it would have supported many things which lower end laptops might not have at that time.
