New Power Mac G4 systems to be unveiled tomorrow with speeds up to 1.25GHz August 12 - 16:33 EDT__Apple will unveil new Power Mac G4 systems tomorrow, MacMinute has learned. Sources inform us that three configurations will be offered: dual-867MHz (US$1,699), dual-1GHz ($2,499), and dual-1.25GHz ($3,299). The dual-1GHz and dual-1.25GHz models will feature ATI Radeon 9000 series graphics cards; additional system-specific details are not available. The dual-867MHz configuration is slated to ship by the end of the week, while the new dual-1GHz model will ship towards the end of the month. Availability of the high-end dual-1.25GHz model is being pegged at sometime in September. Current Power Mac G4 systems will be reduced in price as follows: 800MHz ($1,299), 933MHz ($1,499) and dual-1GHz ($2,199). Additionally, Apple will introduce a SuperDrive-equipped eMac for $1,499, sources say, and will reduce the price of CD-RW and Combo Drive iMacs by $100 to $1,299 and $1,499, respectively.