It's a very low end Radeon 7000 series. It's absolutely incapable of the highest texture quality and rendering resolutions that need more than 8GB of VRAM. You'll likely never go above 1080p on this card (1440p is going to be rough based on benchmarks of the existing low end 7000 series).
There's absolutely no reasonable way to use more than 8GB of VRAM on this card.