That’s the correct way of doing it. Because 1080p is cutting resolution in half, your monitor will display each pixel at native 1080p as 4 pixels on your monitor. If. you run 4K and 50% scaling, your GPU renders at 1080p, upscales to 4K for display, and then AA is applied. This will give you a much sharper image at the same processing cost as running 1080p at 100% scaling.
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