Supported Memory List Exclusivity?

The motherboard QVL lists are created when the motherboard is introduced. It lists the sticks that have been tested on the motherboard and are known to work at that time. Not all ram can be tested, and these lists may not ever get updated.
If your ram is not on the list, check the ram vendor's upgrade/configuration app. Enter your motherboard model, and you should get a list of ram kits that are good, according to that ram vendor. That is useful if you should ever need ram support.