Quad core G0 are hard to find if you try buying ES samples i.e. QX6850 G0 = US$1,500+ right now... As to official channels i was told by a few folks who are testing Intel ES cpus you won't see Q6600 G0 this year in retail.. there's samples being sent out but majority of retail Q6600 will be B3 like current. For quad core G0 might need to wait for QX6850s heh