I have a NVME SSD as my boot drive, yesterday I added 2 HDD's in RAID 0 following step 1.3 in the guide Phuncz mentioned and everythings working fine, perhaps windows has to be installed on the NVME drive before you setup the RAID?
Updated to BIOS 4.40 on the B350 ITX, now Windows Task Manager and Cinebench R15 read my CPU at 3.20 GHz instead of 3.70 GHz. It still benchmarks the same as 3.70, and CPU-Z and HWiNFO64 still read it at 3700 MHz. Something funny must be going on with how the system reports to task manager and Cinebench.
Originally wanted to switch out the RAM for Team Dark Pro 3200 MHz CL14, but it wouldn't boot at all with BIOS 3.40 Got it to boot once with the Team Dark on BIOS 4.40, but lost it again when I tried to overclock. It took way too many times to get the CMOS jumper to reset the UEFI, even after I put my original Corsair RAM back in. Once I did, I noticed I could no longer overclock the Corsair at 3066, the highest I could go was 2666. Very disappointing.
I had enough with trying to get the Team Dark Pro to work, so I shipped it back for G.Skill Flare X 3200 MHz CL14. It pricey, but all told was only $12 USD more than the Team Dark Pro, so I figured might as well. It was a smooth installation, got it to boot on the first try and I hadn't even cleared the UEFI of my previous overclock. Overclocking to 3200 MHz on its XMP profile was easy and painless. Its height does conflict a little with the HDD holder in the Zaber Sentry, but there doesn't seem to be much pressure on the heat spreader or the bracket. I'm only using 1.35V for the RAM overclock so I can't comment on whether BIOS 4.40 is worse in that regard. Seems to be okay other than task manager and Cinebench not reading my CPU clock correctly.
Haven't decided if I'm going to downgrade back to 3.40, or stay on 4.40.
A couple of things here concern me:
You mention downgrading back to 3.40 or staying on 4.40. Was this your update sequence? If so you did not follow the guidance given on the BIOS update page or on many posts. From 3.40 to get to 4.40 you must update to BIOS 3.60. This is a bridging BIOS and without this any higher BIOS will not be installed properly.
But, assuming you know all this and I just missed the info in your posts, firstly I apologise and secondly I would suggest reverting to BIOS 3.60. ( If you did not install 3.60 at any stage then you must install now)
Once you are on 3.60 then your needed update is not 4.40, which is flawed, but BETA BIOS 4.43.
This is absolutely necessary for the Raven Ridge APUs and could well be why your CPU is not reported as functioning correctly.
No need to apologize, I appreciate you looking out for fellow users. To answer your question, I did upgrade from 3.40 to 3.60 first, then 3.60 to 4.40. As I mentioned before, BIOS 3.40 won't even let you update to 4.40 without having flashed 3.60 first, 4.40 will just not show up in the Instant Flash menu.
I am also using a Summit Ridge Ryzen 5 1600 so I didn't think the beta 4.43 was necessary. I can't say if it would have fixed the overclock reporting as I already downgraded to 3.60 and then 3.40.
The power fade in and out may be a clue. I had similar behaviour on the same set up, but seems I had not fully pressed home the 8 pin connector.......So maybe 4 pin is just not enough? Have you tried both sides of the 8 pin connector with the 4 pin?