@Ninam996 Your processor has a graphics chip integrated into it, which is what the programs are picking up. Specifically, it's a Radeon Vega 2; if you're curious, here's more information about it:
https://www.notebookcheck.net/AMD-Radeon-RX-Vega-2-GPU.449455.0.html
The memory listed is shared memory, as in, the graphics chip borrows from system RAM rather than having its own. That's why your laptop only has 6 GB available memory out of 8 installed: the other 2 is set aside for the graphics chip.
To be honest, I'm quite surprised you're able to play on a mix of high and ultra settings with this laptop. But different people have different playstyles and expectations for performance, and that plus the particular packs you have installed may account for the improvement.
As you install more expansions, performance will drop somewhat; how much depends on the EP. The earliest three are mostly fine, but later ones (e.g. Seasons, Cats & Dogs, Eco Lifestyle) can be much more demanding. I would still only add EPs one at a time and see whether you're still satisfied with overall performance. I can't however give you an exact prediction because I don't know your playstyle or what you consider acceptable performance. For example, if you only play a single sim who lives in a very stable world, you're going to see much better results, all else being equal, than someone with an overstuffed household living in San Myshuno.
A useful metric for performance is your in-game framerates. If you see them consistently lower, not the occasional drop but a sustained decrease, you know your computer is struggling with the load. Then you can decide whether it's worth lowering a graphics setting in order to run a new pack better. It's really a personal decision, not one I can answer for you.
