I'm seriously considering purchasing a HD7970 but all this talk of driver issues etc. makes it feel really risky. I'm using a GTX580 now and it's been working well but I want a more powerful card to get a bit higher framerates. 7970 is the only card that seem worth it performance-wise to me but I don't want to waste my money on something that doesn't work. Is it really that unstable like some say?