I don't know what pricing is like where you are but if these are the cards you are looking at the toxic is a way better card, Really without a joke or need to do anything risky you flip a switch and voila you have a 6970.
But it seems that with that toxic card, at 6950 settings when overclocked it will even be better than the 6970, So if you can get it for the same price as the others the toxic is a crazy good card, Lots of options with that card, it is actualy super awesome..
and to be honest im looking for the best 6950 card i just heared these two where good so i used them as examples but i hear people raving about the saphire toxic card but i have used his alot and i never had any issue's with them
No it seems you are misunderstanding, there is a switch like a light switch on the card you flip the little switch and it is a fully functional 6970. Seriously it sounds too good to be true but it isn't. The card has a dual bios you can switch the bios between the two versions using a switch as described above, There is absolutey no unlock or risk, just flip the switch as easy as turning on the lights