Would these hardware be able to run demanding games at 2x/3x?

[EblfIYH]

I am planning to upgrade my PC in some future. These are the alternatives i'm considering:

In CPU part, would an i5-3470 be enough or should I get something better?
Is it a good idea to buy an used CPU?

In GPU part, do you think a  GT1030 will be fine or should I pay for something better like a GTX1050 or GTX1050Ti?

I am about to get 4GB more of RAM to make a current total of 6GB.

Do you think these hardware would be enough to play Super Mario Galaxy 2 at 60FPS at 2x/3x Resolution?
Personally I wouldn't care if there are minor slowdowns. I got used to them with this toaster PC.