Question 980 Pro slow write speeds - not the only one with this issue

I have a ROG Strix B550-F with a Ryzen 9 3900X, 4x8GB Trident Z Neo 3600 16-16-16-36, RTX 3070. Latest chipset drivers, Windows build (19042.746), BIOS update (AGESA

Bought a 500GB 980 Pro a few months ago as my first NVMe. I don't do any workstation work or heavy writing so I don't even know why I chose this as my first but still, the price was good. All was well at first, 6800 mb/s read, 5000 mb/s write.

However, flash forward to now and the write speeds have diminished significantly:

The drive is running at PCIe Gen 4 x 4 as reported by Samsung Magician.

I am not the only one with this issue:

I'm not sure if this is just a problem with the AMD chipset drivers, the 980 Pro itself or something else. I doubt it's something I did, I already tried everything possible to get it running well again. Trimming the drive, verifying write cache is on, checking the drive health (all good), reseating the drive, temperatures are fine.

I don't see a difference in day to day use personally but it would still be nice to get the speeds I paid for.
is the firmware up to date of the drive?

Are the latest AMD chipset drivers installed from here? Updates by AMD tools won´t be that new sometimes

check with a different tool like:
or as ssd

Is it running at PCIe 4.0 or 3.0?

Any other background apps writing on it when you run the benchmark?
Firmware is up to date. Chipset drivers are up to date. It's running at PCIe 4. All benchmark software you mentioned have the same 6800 mb/s read, 1200 mb/s write.
No background apps.
I think I found the culprit:
intelligent Turbo write technology
the cache's size is 512MB, after that, the speed will decrease. so that should be normal. try with IOmeter
Samsung writes :
¹ Performance may vary depending on the SSD’s firmware version and the system hardware & system configuration. Performance measurements are based on IOmeter 1.1.0. The write performances were measured with Intelligent TurboWrite technology being activated. The sequential write performances after Intelligent TurboWrite region are: up to 500MB/s(250GB), 1,000MB/s(500GB) and 2,000MB/s(1TB and 2TB).
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TurboWrite is just Samsung's name for SLC caching. Indeed, TLC speeds are much lower than SLC for sequential writes. You can even calculate it - as stated by the poster above me, Samsung lists it as 1000 MB/s for the 500GB SKU, but it's a simple matter of 16 dies (256Gb/32GiB dies up to 512GiB of flash) times two-way interleaving (two planes) times 450µs tPROG (as given by Samsung's technical document) with a 16KiB page size and you get ~1100 MiB/s (math here) or 1165 MB/s which matches OP's result.