I have Q8400 at stock clock. Right now I have a hd 6850 in the machine and 8gb of ddr3 memory, but that gpu is just suffering with new games and i was thinking about upgrading it with some newer GPU. I'm thinking something like r9 270x, gtx 960, gtx 760 or r9 280. I was wondering if anyone has any better suggestions, or which one of thoose gpu I've mentioned is best. The price range is somewhere about the cards I've mentioned. Cheers!