TweakTown posted a review on the Sapphire Radeon HD 5970 2GB Overclocked video card

We mentioned in our standalone review that there was really more to the HD 5970 than just what meets the eye. We also covered the fact that ATI have kind of pushed this whole thing about the HD 5970 being "Unlocked." At first glance it's a little hard to figure what exactly ATI mean when they're saying this. Generally speaking, in the computer world the term "Unlocked" tends to refer to a CPU and the fact that it is multiplier unlocked.

So, what does this whole "Unlocked" mean for ATI’s latest giant card? Well, you can't enter some secret key combination and unlock more stream processers or ROPs, nor is there a secret to gaining extra memory. What ATI mean by saying the model is "Unlocked" is its overclocking ability.

Sapphire Radeon HD 5970 2GB Overclocked Review