You need to pay attention...
They left A.I. ( Artificial Intelligence ) enabled, thus the benchmark becomes CPU limited and differences between differently clocked or even maker CPUs arise.
Considering that in a sum of games the 5870 needs an i7 clocked at 3.7GHz to be CPU-limit-free, and there you have it.

I know I'm going to have a hell of a time if what I saw and my other info is wrong, but here it comes:
The GTX 380 will be nearing the 5970 in most games, and will have a significant advantage over the 5870.
Regarding the price... well, if you're a realist and live under no illusions, then it's easy to say that it will be priced similarly to the 5970, normally 50 bucks lower or so.