I was able to boot into windows and played some games
What games are we talking about here? What resolution are you gaming at?
Is it safe?
So long as you're on the latest BIOS version for your motherboard, have optimal airflow in your case and you've left all timings to AUTO in BIOS, then you shouldn't face any instability issues.
IMHO, you should've looked into a DDR4-3600MHz dual channel ram kit for your platform so all you needed to do was enable X.M.P/D.O.C.P. Since you're on an APU, latency doesn't matter for your ram kit, only the frequency though your ram will degrade over long exposures to gaming off the APU. If you're looking to game for long hours at 1080p, then get a discrete GPU and a tight latencied DDR4-3600MHz dual channel ram kit to get the most out of your platform.
My 2 cents.