Video card recommendations?

[TkSilver]

Anything under a X50 in Nvidia's line up is not a card for gaming but more of just a graphical acceleration and Video card.To answer your specific comparison the 710 and 620 are near identical in terms of performance. So it would just waste money to replace one with the other.

A GT 730 would be an improvement though maybe not as much as you would want or need. To be fair a GTX 750 would probably be closer to what you need. Also keep an eye out for some GTX 9XX series cards that may be getting sold used as people jump up to the 10 series, you might be able to get a much much better card if you are willing to get a used one.