GTA 5 only runs with regular stuttering. About every 7 - 10 seconds the FPS drops below 20.
With the update 19.11.X I could also set to 3840 x 2160, since I installed the driver 19.12.1 it can't do more than 1920 x 1080. At every higher resolution the graphics card doesn't send a signal to the screen anymore.
I have already run FurMark, Cinebench and another tool. Sometimes even at the same time and there were no problems. Also a MemTest was inconspicuous.
CPU: AMD-FX8350 (8 x 4 GHz, DDR3-1866)
Ram: 4 x 4 Gb (DDR3-1333)
MainBoard: ASRock 970 Pro3 (DDR3-2100)
XFX RX 5700 XT Thicc III Ultra
Attached you will find graphics with further information.