Looks like this thread is dead. GTX 285, GTX 295, GTS 250, HD 4830, HD 4850 X2 all missing. Or course almost no site is using Oblivion for a benchmark anymore, so its based on assumption (which landed the 9800 GTX+ below the HD 4850, which I still say is patently wrong).
No, I don't think you're quite right there.
I agree that the 9800GTX+ and HD 4850 are more or less identical. HOWEVER, the way he has it is that the 4850 is only one spot above the 9800GTX+, which I'd say is correct. This is because the 4850 handles AA much better than the GTX+ does.
However, I do think that he should place them both either in extreme or egad...not different categories.