QVL's are a way of saying that the ram in their list was used for testing in the motherboard manufacturer's lab prior to launch, meaning they will work out of the box. This doesn't mean that other ram kits won't work. If all kits were to be included in a QVL, then the board wouldn't see the light of day with regards to a release. If you will, so long as your motherboard supports the speeds and the processor you're working with can handle the rams, then yes they will work.
Also, in most cases, you should make sure you're on the latest BIOS version for your motherboard prior to enabling X.M.P.
Mind sharing what processor you're working with? A link to the ram kit you're looking at purchasing?