My minimal research found the Optiplex 9020 SFF Desktop PC your looking into has a 4th and a GeForce GTX 1650 Low Profile GPU with 4GB VRAM. Although this particular Optiplex PC does meet Valorant's recommended system specifications, you might be better off looking for a PC with somewhat higher specifications, especially since evolving games like Valorant may or may not require a change to they're system specifications and you might also need more powerful computer for running more hardware intensive games that you might find out there. Since the motherboard for that Optiplex 9020 SFF Desktop PC doesn't support anything higher than a 4th generation Intel CPU, the Optiplex might not be it.