The integrated Vega 11 is on par with the GeForce GT 1030. I used a GTX 1060 with that CPU and it was fine with lots of RAM installed.
Right now I have 32GB of DDR4-3200 but I was using 24GB of DDR4-2400 with the R5 2400G before I grabbed the R5 2600 for the MSI X570-A PRO motherboard I am using now.
The R5 2400G can handle even the RX 5700 XT fine if that is what you want,