Thanks for the recommendation. Pc is not very old but graphics card surely is and I never upgraded it since I hardly play any games on it. Probably just gonna try this game once or twice.
An RX 580 would probably run GTA at reasonable frame rates and settings if your display is 1080p. Doubt it would do too too well at any higher resolutions though.
Apparently I have managed to misremember the heck out of RX 580 benchmarks. I must've been thinking of RX 480 4GB results or something. I still run GTX 970s, so haven't kept the greatest tabs on anything much newer. Oops.
RX 580 does come in 4GB version, which is cheaper, but the 8GB isn't more pricier.