I have a very similar system. I put in an old Geforce GTX 465, 1 GB and I am able to run GTAV, Fallout 4, No Man's Sky... It doesn't take anything really special to run your games unless you demand 4k with cherries on top.
That said, mine is an AMD A8-3870 4-core APU so I was able to run Fallout 4 before the GPU with some custom settings, like 90% of the bushes were gone unless you looked through a scope, which was great for visibility.