Yeah i mean right now the top dog performance wise is still nVIDIA, but if you look at the prices... the HD4870 will be around 250 euros, if rumors are
true, but the GTX260 is 380! And the HD4870 is slightly faster, expecially with AA and AF enabled, wich has been green territory for more than a year and a half! And the 4850 does the same to the 9800GTX, wich again performs similarly but costs more, and this forced nVIDIA to lower prices and make a ridicolous 9800GTX+ wich you will need to overclock to gain a small advantage over the HD4850, but will cost significantly more...
With the HD4870x2 in a good position to take the performance crown, nVIDIA better get some uber drivers out already.
Aw and if AMD makes a decent tri CrossfireX motherboard that could help sell some of those new quads they got.