give a 3-star rating as I be fairly certain I just have\/had really bad luck . 1st card would gray - or vertical lines-screen at random , usually at idle , but sometimes under load , regardless of driver , clock setting , bio switch position , even in another computer . I contact Amazon for a replacement , and they cross-ship I one STRAIGHT away . however , the second one not only have the exact same issue , but it be cap\/choke whine be 10x worse than the 1st card . so , 2 bad card in ... no more . return . now , let I clarify\/go over a couple thing . 1st of all I would like to make note of how great Amazon 's customer service have be . it be unfortunate they 'll soon be force to charge sale tax in my -lrb- and other ' -rrb- state -lrb- s -rrb- , as I now would choose Amazon over newegg , any day . do not get I wrong , Newegg be great still , but Amazon 's really take the cake in my book . even with the problem , they have earn a loyal customer . even if there be a minute price premium here , I may still choose Amazon . secondly , I be not the only 7970 buyer that be have this same issue\/type of issue . I know of several other on at least 1 tech forum , overclock.net , that have have the same or similar issue , with other brand 7970 . it appear the issue may be bio -lrb- firmware -rrb- related , or Voltage Regulator related . I do not know the exact cause , but I really do not blame Amazon , AMD , or Sapphire directly for this . while I will probably get a 670 or 680 from the competitor -lrb- 1 or 2 specific application optimization -rrb- , please do not let this deter you from get this card . I honestly believe I just have poor luck , and as the 7970s drop in price , they be get a better and better deal . thus , I give it a mid-point 3 star . I have issue , twice over , but Amazon 's make I right , and I honestly believe I stumble upon a statistical improbability . these card OC well , perform incredibly well for the price point , etc. .