The point is, you should have posted this in the Hardware Forum. And please read the forum rules before creating posts.
At any rate, the GT 520 is a fairly weak card, both for PC gaming and Dolphin. CyberPower wanted to give me that GPU, but I upgraded to something decent. Check out the Minimum GPU specs thread for info on roughly how well GPUs do with Dolphin. A GT 520 should be good enough for 1x Internal resolution, probably even some AA. Anything more will probably be asking too much. I'm not a GPU expert though, it might be better than your Intel IGP (depending on which one it is), but not by a phenomenal amount.
At any rate, the GT 520 is a fairly weak card, both for PC gaming and Dolphin. CyberPower wanted to give me that GPU, but I upgraded to something decent. Check out the Minimum GPU specs thread for info on roughly how well GPUs do with Dolphin. A GT 520 should be good enough for 1x Internal resolution, probably even some AA. Anything more will probably be asking too much. I'm not a GPU expert though, it might be better than your Intel IGP (depending on which one it is), but not by a phenomenal amount.