Hello, I have a rtx 2070 currently and I just saw the new 30xx series and was wondering if it was worth upgrading because the 3070 is quite affordable for me, but my questions are if I would need to upgrade my psu or any other components to run the 30XX series and would it be worth to pay the extra 200 for the 3080, also is there a good place to sell my old cards (never been overclocked or anything)