Yeah I see what you were saying. I was referring to the 7970 Ghz Edition which came out after the 600 Series dropped. The 600 Series initially pulled ahead when it dropped, then the 7970 Ghz Edition came out to even things out and driver support had increased performance for AMD parts.
Nvidia improves as much or more than AMD with drivers overall. Your information is not completely wrong, but you seem to think that Nvidia was there and AMD just pulled ahead, but that's not true. It was back and forth multiple times.