The G4 is newer, has a faster bus, more cache, and sometimes even L3 cache. A G4 of the same, or even slower clock of a G3 would still crush it. In OS X, it's even more apparent, as the Altivec CPU extention, otherwise known as the velocity engine, is heavily optimised in OS X, and Much of it's core technologies, such as Corevideo. Overall, a G4 is much better than a G3.
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My Rig
Pentium 4 2.8 GHz Northwood
Intel 845GVSR Motherboard
1 GB PC 3200 DDR
BFG Tech FX5500OC 256 Mb PCI Edition
160 GB WD Caviar SE (8 Mb cache) Edition
60 GB WD Caviar SE (8 Mb cache) Edition
Sony DVD-Rom/CD-RW Drive
Dynex DVD+-R/RW Dual Layer Drive
Nice MAG Innovision 17" LCD Flat Panel Monitor.
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