@RafeP
The QVL is just a list of memory that the MB maker has tested.
Your motherboard supports DDR4 5200, but remember that the MB has the easy job. It just moves the data from the memory controller (part of the CPU) to the memory sticks and back. In order to process data at that speed, the memory controller is working beyond specs (OC). If your desired memory speed is beyond what the memory controller can handle there will be errors and eventually the system will crash. That's not the motherboards fault, you pushed the memory controller too far.
Why does QVL not have more/higher speed memory listed?
- They had trouble getting higher speeds sticks to work consistently (remember, they are advertising that they have tested this and it works).
- They didn't try that hard ... and that's ok. It's our jobs to take systems to the bleeding edge. The MB makes job is make quality hardware that works consistently and gives us options (like pushing our systems).