Greetings,
I've just built a new system:
GA-Z170X-UD3 (F4 BIOS)
Samsung 950 Pro M.2 NVME PCIE SSD boot drive
2 x SATA HDD to be configured as RAID 1 data storage drive
32GB Corsair RAM
Clean install of Win 10 (not cloned from something else).
The 950 Pro SSD is installed in M2A-32G.
I initially installed the OS (from USB drive) with only the SSD connected. It installed and booted fine. Runs super fast.
I then connected one of the HDDs, left the SATA settings at AHCI. All ok: I can see my old data on the drive, system continues to boot from SSD and is stable.
Problems occur when I switch the SATA settings (in BIOS) from AHCI to RAID. No matter what combination of settings I try (Win8/10 mode or Other OS mode, CSM enabled or disabled, etc.), as soon as SATA controller is set to RAID, I am no longer able to see or boot from the SSD.
Other observations:
I can never see any options/details in the NVME Configuration menu in BIOS.
Some other boards seem to have a setting to ensure that the M.2 PCIE interface has access to PCIE lanes under various configuration settings - but I can find no configurable options anywhere for the PCIE interfaces (of any form).
I have avoided SATA3_4 and SATA3_5 for the SATA drives (one of these is not available when the PCIE x4 SSD is in use).
Any help would be very gratefully received.
Richard.