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Street price for 7970 is 90-100, gtx 660 is in 60-80 area. Buying and selling them night in night out.
they are bad in any other algo which is not ethereum, and they consume a lot, 480 is vastly better on etheruem and will hold its value for a long time, no matter what will happen to the mining scene, due to gamers have high interest in them since they are brand new