Buying a mining card R9 270, worth the Risk?

BrokeGamerTom

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May 22, 2015
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Even though all the parts in my pc are brand new, I am still on a tight budget, after reading thread on another forum, I ordered a R9 270, for 86 dollar all fees included. I thought it was a steal, only to find out later that he used it for mining, in reply to my question after I ordered it and it was asked while bidding was ongoing, "Used for mining about a month, 2 fans blowing on each rig" also said "give it couple hours of rest each day". Even though I have already ordered it, should try to return it to him. My actual PC is about 250 bucks, with the cpu that I have it will bottle necked for sure. So I don't think it will need to perform at 100% load at least until I upgrade to a Athlon x4 860k from current A4-6300. Was it too risky, should I keep it?
Should I underclock it to be safe?