It's somewhere around an AMD RX 570 or nVidia GeForce 1650 performance wise. It should still work for modern games. Just don't expect spectacular performance.
As for the rest of the system. I wouldn't worry too much about that. Build however high performance system you want. It's not as though it is a static component. You can always upgrade the card later. So, I'd make the rest as fast as you can afford. Pay attention to price performance of a used CPU and motherboard. Those parts are frequently overpriced if you are getting DIY parts and new might make more sense. The best prices/performance in used is usually getting some Dell/HP workstation. Then getting a better PSU, GPU and an SSD.