That’s weird on the windows speeds. I believe mine is a 4.0x4 too and I got full speeds on everything. Id have to assume it’s a Windows issue though

I had a 1 TB one I used for the longest time. My only complaint is that it never played well with any of my Linux devices (Steam Deck randomly decided it was done reading it and I had to unplug it and my Bazzite device just locks up)