GTX 480 will be 40-50% faster than 5870. And would you know vhy...
Because Nvidia drivers for DX11 would have more performance in DX11&DX10 games...
You all know that DX11 for 5770(an example) lowered the performance..
I mean 5770 shoud have about same performance( in DX 10 games) with 4890(same specifications) , but it don't have it.
5830>=4890.
So GTX 480 will beat 5870 with the "power of drivers to"..