hey found this thread as I have the same issue on a 480gb MP510,
I've tried the suggestions from the corsair rep in the thread and this speed test is after,
- disabling 'PCI-Express Link State Power Management'
- disabling fast startup in Windows
- rebooting after making the above changes
MP510 480gb
- 59% full
- Read speeds 3.4 GB/s
- Write speeds ~550 MB/s (Expected ~2GB/s)
- Firmware version ECFM22.7 (updated after encountering issue, updated via Corsair SSD Toolbox)
- Installed in top m.2 slot on motherboard direct to CPU
Other system information
CPU: Ryzen 5 3600
MB: MSI x470 Gaming Plus Max, bios version H.60 AGESA Combo-AM4 1.0.0.6
RAM: 2 x 16gb 3200mhz CL18
OS: Windows 10 Pro, version 20H2