Re. The ram difference;
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based on this, 4TF 1080p machine with similar fidelity should be okay to handle next gen games. Probably we will see some effects scaled down as well but it shouldn’t be too demanding on developers. Think about pc games and graphic settings where you can toggle things like draw distance, particles, RT and other effects. Game design will not require 2 separate work streams.
We are talking about 8GB Ram in TOTAL because of that unified memory system.
So you would have a 4GB Graphics Card with 4 GB of RAM. I dont know about one lower bugdet gaming PC with 4 GB Ram. They start at 8GB and have a graphics card with 4-6 GB RAM.
8 GB Unified Memory dont seem fit for anything next gen to me.