That all depends on the game(s), the GT 730 is just a weaker R7 240 (very slightly, mind you). Aside from the GPU, we can't get an actual estimate if you don't post your other specs. I'd expect newer/modern games to not run well at all (probably not even at 800x600 at 30+), but some older games (Tomb Raider 2013) might run medium-high.