HWInfo is saying the same as CPU-Z. You're looking at the XMP profile box which is what's baked on the SPD, not what's running.
Your XMP boot is likely failing and ASRock bios booted it in the slowest possible configuration.
Set these voltages manually up to the max in parenthesis
VCCSA 1.3V (max 1.35V)
VDD_CPU 1.35V (max 1.4V) - this should be CPU VDD2, verify in HWInfo
VDD_IMC 1.35V (max 1.4V) - this should be VDDQ_TX, verify in HWInfo
and then try booting 5200/5000/4800. You then want to test the IMC using y-cruncher stress test on the "VST" test after you successfully boot. You only need to run it for 10 minutes. If it fails, drop the clocks by 200.
Alternatively if you can live with 96GB, 2x48GB is much more likely to work out of the box.
