Okay so I have a R9-280x Sapphire Vapor-X Tri-X OC Edition (the blue one). It cost me $300 like 3 years ago. I'm thinking of selling it and getting an RX-480 8gb, but I can't find a price. The prices on Amazon are all over the place. So my question is, what should I charge? It's still like new as I'm a non smoker and I barely played on it. Never OC'd (other than factory).