I wrote about how Unified Memory, SSD directly attached to the SoC and Apple's use of real-time compression saves memory, reduces power consumption and wear on SSDs [1].
In practice I think this is going to be very specific to your data being good for compression and not already compressed - so not gaming, where textures can fill up the Neo's 8GB very fast depending on the game: Cyberpunk, Robocop, Bioshock and Shadow of the Tomb Raider benchmarks are showing 9 - 10 GB of RAM used at just 720p.
In practice I think this is going to be very specific to your data being good for compression and not already compressed - so not gaming, where textures can fill up the Neo's 8GB very fast depending on the game: Cyberpunk, Robocop, Bioshock and Shadow of the Tomb Raider benchmarks are showing 9 - 10 GB of RAM used at just 720p.
https://www.youtube.com/watch?v=uOe-Ock4pnw