i have a 6990 with phenom 2 x4 945 oced to 3.5ghz,i will be buying intels next installment of hasswell cpus ,so right now 6990 is pretty slower to a oced 7970 and 680 in mordern games this frets me ,so can i have this gpu for another year or sell it ,i game at 1080p ,if to sell how to sell,some people have recomended me to sell to bitcoin miners if so how to sell to them