I bought a few days ago a Sapphire Radeon Rx 570 4gb Pulse for my Ryzen 3 2200G and I have some real stuttering problems in Gta V at almost the lowest settings and 1080p , before I upgraded the gpu, I used the vega 8, which also had some stuttering problems, but it didn't bother me as much. The strange thing is that only Gta V is stuttering, i can run Cs:Go at max settings at 1080p at 170-210 fps without stuttering. I have the Gigabyte B450M DSH3 with the bios version F41, Corsair Vengeance 8gb 3000 mHz dual Channel, I use the amd stock cooler for the cpu and I have 6 Floston ICE15 Red fans. This combination of components should have made an alright 1080p at low/medium settings machine. I saw some youtube videos with the same specs as mine and they somehow ran Gta V much better than I am. I have not overclocked the Cpu, nor the gpu. At the cpu I only changed the voltage, from 1,4 to 1,35 and at the Gpu I changed the fan speed to 50. My cpu stays at around 27 celsius degrees at idle, 50-60 in gaming and my gpu stays at 21 degrees idle and 40-50 in gaming. Even when I go through the settings I have some stuttering, which you will be able to see in the video below.