1.5 GB of RAM?

I've seen a couple of phones advertised as having 16GB of ROM and 1.5GB of RAM, at least a Samsung phone and a HTC phone has that technical figure, I didn't search further but I think the list could be a bit longer.

So the question is why 1.5GB and not 2GB? It's really 1.5GB or it's 2GB with 512MB used for something else?

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1.5 GB of RAM?