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My current phone is advertised as having 3GB of RAM. Under Settings/Memory Total Memory is listed as 2.8GB.

I recently saw a newer phone with a more modern System-On-a-Chip with 4GB of RAM. Total Memory showed as 3.5GB.

From reading around I believe the difference is down to the memory being set aside for graphics (or perhaps peripheral addressing at a guess, failing that).

If the former, as the screen resolution is the same (1920x1080) and I never had a problem with graphics on the old phone with 200MB set aside, is this something that can be varied, perhaps in a custom ROM, for instance Lineage, or would it be be buried too deep in hardware drivers?

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    It should be changeable in kernel - back in the old days where a little bit of RAM matters, devs would squeeze RAM from all sorts of places (including graphics) to decrease the default/idle RAM usage. – Andy Yan Jun 12 '17 at 13:50

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