So after randomly running into this, I think I might just go with the SN850 and return my 980 Pro as I have not opened the 980 Pro yet.
https://www.techpowerup.com/forums/threads/getting-slow-nvme-write-speeds.274572/
980 Pro series SSDs seems to be running into a situation where after a certain % of the drive being loaded up with data, the write speeds drop from 5000 MB/s to 1000 MB/s. Now while it's "Normal" for SSDs to do that in large file transfers as SLC cache runs out, what's not normal is the fact that it stays at the low write speeds for a long period of time afterwords, especially when it's not close to being full. Some users are saying that it doesn't go away until they do a full secure erase. Going by the thread and others, it sounds like it should be fixable once Samsung releases a firmware update since the issue seems to be the drive not clearing the cache.
Also be aware that no one knows if this affecting every 980 Pro or just some but if you google 980 Pro slow writes... There's a good number of threads throughout the internet about this. I can't find any similar issues with SN850 yet though.
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850
