It depends on which variant of the 730 you have(there are 3).
Light games such as minecraft will run smoothly and without any issues. Demaning games which scale down well will run at a playable framerate(30fps) with low details in 720p if you have the gddr5 kepler variant. Heavy and non optimised games won't run smootly no matter how much you reduce the settings.
Yes it really depends if you have the GDDR5 or the DDR3 version of the card, if you have the GDDR5 version you have a better options, that being said I would recommend getting a Steam or/and a GOG account. I would say you should be able to play most AAA games between 2004 -2012 @720p at probably medium graphics maybe even 1080p some of the older games.