I installed every driver from the MSI website, including the 1.1 BIOS update. Pretty certain i've got intel RST and IME running in the background.
Might be worth double checking if its actually it versus generic Windows ones in Control Panel.
I agree. I don't actually think theres any defect in the drives. Im sort of suspecting some kind of activation or failure to activate some kind of power setting on the drives through the AHCI interface, but it doesn't quite work due to the RAID combined with SSDs.
Between the drives possibly...
I recently put together a Skylake build:
Motherboard: MSI Z170a Xpower Titanium
RAM: GeIL Super Luce DDR4 4x4GB 2800Mhz
GPU: MSI 390x Gaming G8
Boot drive: 2 x Samsung SM951 AHCI 128GB in RAID 0
Data drive: 1 TB Wester Digital Black
Case: Corsair Air 540
PSU: Seasonic Snow Silent 1050W...