The 2nd Amazon review looks like it's running at Gen3 speeds, ~3 GB/s in R/W.
I'd avoid the 980 Pro it has a widespread failure problem. Samsung tax also makes it way overpriced.
The code expires on 11/26.
For anyone still after the 5800X3D, they are listed $400+ right now. But it might drop back to $329 before then, which would be about $294.