I'm playing on a GTX 1050 /i5 /8GB gaming notebook without SSD. It's a weak PC, but the game runs perfectly with no crashes on high graphics. I can't talk about HDR, but the lighting is beautiful and as it doesn't have ray tracing I think it's simulating it. I do not use external software. The brightness adjustment just doesn't work in the middle... either it's dark, or it's too bright, both of which make it impossible to see properly.