GT710 is an entry level display card.
If the games are fast action, you really want a stronger graphics card.
A GT1030 or GTX1050 does not need aux power and will run on motherboard slot power.
Such a card can be moved later to a pc with a stronger psu.
As a test, Run YOUR games, but lower your resolution and eye candy.
If your FPS increases, it indicates that your cpu is strong enough to drive a better graphics configuration.
If your FPS stays the same, you are likely more cpu limited.
If you need more cpu horsepower, plan on perhaps $250 for an entry level G5600, 8gb of ddr4 ram and a lga1151 300 series motherboard.