It is mad how fast they are.

Remember many years ago (2006 onwards) PC gamers were going mad over those Rapter drives? Hitting over 200MB/s on the right setup. Now the fastest NVMe Gen 4 M2s can achieve 7000MB/s, or 6.8GB/s.

That's just mad numbers and importantly for game designers removes all data transfer speed limits between storage and ram. You can literally just swap out between ram and storage in realtime. So no load times. This is what was so revolutionary about the PS5 design.