RV770 is not confirmed.  

If you take a look at Engadget's sources, you'll see that they're just speculating. None of them say it definitively. In addition, a lot of devs imply that it's only slightly more power than PS3, and no programmer in their right mind would say that about an RV770. To be safe, that should be removed. Even if it is true, the specs aren't even finalized, so that might be changed. It's best to stick to "Custom AMD Radeon HD" until either Nintendo gives full specs or someone tears it down and confirms the GPU. (173.2.210.40  )