I'm not sure where the other guy got his information who said it was 'definitely compatible'.
The ram that Gigabyte motherboards 'certify' compatible can be found on their webpage:
http://www.gigabyte.us/Motherboard/GA-AB350-Gaming-3-rev-10#support-doc
Look under the support list tab for memory support list.
If it isn't on the list it MAY work, but it hasn't been tested, and you MAY have problems either immediately or later.
For me, it is NEVER worth it. Ram problems can cause all kinds of pull your hair out problems that are REALLY hard to figure out if it is your CPU, Power Supply, Hard Drive, or video card. Ram problems can create symptoms that look like any of these, and it's not worth it.
Buy ram that is on the supported list. Then you have a high degree of certainty that you won't spend hours or days of your life trying to troubleshoot a tricky intermittent ram problem.
This is just basic advice, like 'don't buy the cheapest power supply', 'don't buy the cheapest no-name motherboard'.
Stay with ram recommended by the motherboard manufacturer.
(As an edit, I would mention that it didn't used to be quite so important... you used to be able to use ram from a lot of different places and not have much trouble. Things have changed. Ram compatibility isn't as certain anymore.)