The 5570 is a little faster than a 3850/3870, so if a 3850 is in the min or recommended requirements it can play it, but maxed out not as much. My friend plays League of Legends on a flat screen TV with the 3850 I gave him and seems happy with it. Only get the 5670 if you know your PSU is a decent quality unit, because if it's crap bad things can happen
. If you're going to upgrade your PSU then you may as well go with something a little more powerful than a 5670 anyway.