Hardware Reserved Memory, Motherboard/RAM Compatibility Issue?

Oct 11, 2018
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I have G.Skill TridentZ F4-320016D-32GTZKW, which is two 16GB DIMM sticks of DDR4 3200 MHz (https://gskill.com/en/product/f4-3200c16d-32gtzkw)

and an ASRock Taichi x399, which takes DIMM DDR4 up to 3600 MHz (https://www.asrock.com/MB/AMD/X399%20Taichi/index.asp)

and neither is on the Qualified Vendor List for the other. My PC turns on, posts and runs fine.

However, in Windows, half my RAM (a little bit more than one 16GB module) is hardware reserved, which I have read could be an issue with compatibility, although with some people there was an option in the BIOS to unlock it. That option isn't there for me. It's also not reserved for onboard graphics because neither the CPU nor the mobo have integrated graphics. I have tried removing one module at a time and I still have 16GB available. Everything is working well enough (16GB is plenty for what I'm doing) but I'm wondering if things are being throttled by some incompatibility and I might get better performance trying other RAM from the QVL. I would also like to have access to all 32GB at some point.

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Specs:
CPU: AMD Ryzen Threadripper 1920x 12 Core 3.5 GHz
Mobo: ASRock Taichi x399 ATX
RAM: G.Skill TridentZ DDR4 3200MHz (F4-320016D-32GTZKW)
GPU: AMD Radeon RX 560 4GB GDDR5 1196 MHz
SSD (primary boot): 2.5" Sandisk SSD Plus 240GB
SSHD: 2.5" Seagate Firecuda 1TB 5400rpm (ST2000LX001)
HDD: 3.5" WD Black 4TB 7200rpm (WD4005FZBX)
OS: Windows 10 Home 64-bit v1703 Build 15063.1387