I heard somewhere(I think Lowend Mac), that the 970 would go 4 times faster per mhz than the G4. Let's say a Dual 1.42 Ghz G4 goes about the same speed as a 2 Ghz Pentium 4. (just an estimate, the G4 is probably much faster). Wouldn't that mean a 970 of the same speed would go at the speed of an 8 Ghz Pentium 4? Anyway, what do you think about the speed difference?