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Even the Macbook has dual-channel memory. They don't have RAM slots--they solder memory chips directly to the motherboard.

Having RAM slots that are user serviceable and having them soldered directly into the motherboard is besides the point.

If there is only one RAM slot (whether soldered-on or otherwise), then the total memory that can be supported is at most 16G.

There are no DIMM slots at all on an MB or MBP motherboard. There are bare memory chips soldered in a dual channel configuration.