MacWorld just posted them. A 1.5 GHZ G4 had a speedmark of 136, whereas a 1.8 GHZ G5 posted 148. Not a lot of difference with most of the speed differential likely due to the increase speed of the chip. The faster frontside bus helps, but not as much as you would think. G4's are great chips and with the new dual core G4 coming out (which is capable of running a separate operating system in each core) the G4 is going to make a big run at the G5.