Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Well an OC-ed 7950 can match a 7970 GHz edition, but again a 7970 usually has more headroom for overclocking.
If I were you, I would just get a 7970, I was in the same boat about 5 months ago and got the Sapphire Dual X 7950, great card love it, but if you're anything like me, I rue not having got the better card when I had the chance. Mind you - not that my 7950 is not capable. mine overclocks to 1175/1650, just that I wish I had more..lol!
So if you want the absolute best bang for the buck, get a 7950, but you can't go wrong with a 7970 either!
Whatever you plan on getting, get one that is NOT voltage locked.