The Raid drivers you are using are quite old, please try again using the latest drivers linked here > X399 Drivers & Support | AMD
Please note, it is important to make sure you select the correct Raid driver, select the Raid and Sata nVME driver 711kb and load these drivers prior to installing the latest Windows build.
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karatsonyi, when you do the Load Driver during W10 install, are you using the specified order? Please use this order:
I suspect amdatt has hit on the problem. I have not tried 1809 but 1803 works fine and I expect 1809 to be fine also. Please do not go back to 1703. I would also encourage you to check the MSI forum. In this thread the user is having trouble with an SATA HDD RAID, but the RAID0 NVMe works fine. I am user jhchris and trying to help. There are also several Beta UEFIs available there. BTW, I have the same MB and CPU, but have not powered up yet. Enjoy, John.
EDIT: Here is a snippet of instructions I created for TR RAID on an ASRock board:
11. Install the RAID drivers in this order:
1-rcbottom - all your drives in the RAID will disappear
2-rcraid - you will see your one RAID
3-rccfg - you are good to go!
Also, I strongly recommend you get all your drivers from the manufacturer not the MB Vendor. In some cases a MB vendor may require use of their driver (modified) - you are just stuck then. ALWAYS get the AMD drivers from the AMD Driver DL site. Please make sure you have the latest AMD Chip Set driver from there. You should also install the latest version of RAIDXpert2 (RX2).