Semi related, DLSS is like magic, such as this example of how good 76p (not 720p, 1080p, etc) can look: https://youtu.be/DKCyk3CeUFY?t=300 (link should be to 5 minute mark)
Their YouTube channel has the excellent deep dive on the unreal engine's nanite virtual geometry system: https://youtu.be/eviSykqSUUw
The one on idTech8 global illumination from last year is pretty interesting too.