That depends what coin you will mining. Because every coins can be mining but there's a lot diff at every coins. And also depends hashrates of your total gpu. What as i know, for mining to day need more than 180 mh/s if you want more profit per month. But until to day i still mining ETH and siacoin, with total hashrates about 120-140 mh/s, not much profit but i can trading the coins.