For a while now, I've been buying HyperX (Kingston) 2400 and 2666 MHz DDR4. It has been solid on all prior motherboards (H110, H310). I had bought six of these motherboards since stock from my suppliers ran out.

I built a system with the first of six motherboards, i3-9100 (supports a max of 2133 MHz), Samsung 500GB 970 EVO Plus and a single stick of 8GB 2666 HyperX DDR4. Yes, single channel with one stick. BSOD (WHEA Uncorrectable Error).

As a tech, I've changed practically everything including tried a second motherboard and CPU to no avail. ASUS said it's the RAM not being on the Qualified Vendor List (QVL) and I believe them. Though, I've used the RAM on several other CSM boards with positive results. It's just strange it doesn't work on this board. Maybe it wants two sticks or a brand and model from the QVL.

I'm going to buy compatible Crucial 2400 or 2666 DDR4 from one of my suppliers and am hopeful this solves it.

Is the H370 really that sensitive?

Last update and conclusion: It's a motherboard bug with the ASUS and by the looks of it, a few of them. I ordered a few Gigabyte H370M DS3H and this board has no such issue. Gigabyte has excellent support documentation on the QVL for SSD's. ASUS is lacking in that regard.

ASUS and Samsung have tried to be helpful but only provide the simple scripted solutions. If only they'd escalated the ticket, we might have actually gotten somewhere.