I got a 2TB one today and during the full format, the write speeds in Task Manager showed:
* 70MB/s for the first few seconds.
* Then 3.2GB/s
* Within four minutes it was down to ~680MB/s with brief spikes to 1.5GB/s or 2GB/s.
* Within 15 minutes it had stabilised around 750MB/s.
* Full 2TB format completed in 28m58s, averaging only 1.07GiB/s for the 1863GiB reported capacity.
I am very disappointed, this is obviously the InnoGrit version. I bought it specifically for the high sustained write speeds and it is not fit for my purposes. It will be going back.
It is quite unfortunate that they can just change the SSD like this, it is substantially gimped.
The heatsink also has a sticker over one of the screws stating the warranty is void if removed, that also sucks. Corsair doesn't do that.
The heatsink is also too wide, it blocks my neighbouring M.2 slot.
I got a Corsair MP600 Pro XT about two weeks ago and that did a full format averaging 5.56GiB/s (5.5 minutes for 2TB, or 1863TiB full format).
I was thoroughly impressed with the Corsair, and they don't void warranties for heatsink removal. I will probably look for another in the upcoming Prime Day/Black Friday sales.