I have a (2GB) R9 380, and although I don't have overwatch I can tell you it is good; although rather loud if you want respectable temperatures (I have the sapphire nitro one in a corsair 250d). I get consistent 450fps+ on CS:GO which sould translate to like, I dunno, 60-80+ for slightly more normal games? Just guessing xD. For shits and giggles I loaded up Minecraft and put the graphics settings to minimum, window size minimum, and went into a void world for maximum performance. I only got 2450fps, not enough imo :(.