Put this one together with my 10yo son. We overclocked the iGPU to 1575MHz and the RAM to 3333MGz. We ended up leaving the CPU alone. It's not a bad little rig.
Edit: ended up overclocking the CPU to 3.850GHz with core voltage at 1.3850v. I was also able to get the iGPU up to 1620MHz.
Edit 2: we swapped the Ryzen 3 2200G for a Ryzen 5 2400G (which I was able to pick up for $100, so only $10 more than the 2200G we originally had in the system). The CPU is overclocked to 3.95GHz (at 1.416v) and the iGPU is overclocked to 1550MHz.