The new Power Mac G5 systems can use up to 8GB of 400MHz DDR SDRAM and graphics card support of up to 256MB of video memory, the company said.
The top model in the series has two 2.7-gigahertz processors, each with an independent 1.35GHz front-side bus for bandwidth of up to 21.6 gigabytes per second, it said. The computer, which supports Apple's 30-inch cinema high-definition display, comes with a 250GB hard drive and starts at $2,999.
Prices start at $1,999 for lower-end systems with dual 2GHz processors and a 160GB hard drive, Apple said. A single-processor machine is priced at $1,499.
The machines, due this week, will come loaded with Apple's, which will be officially released Friday.
The new Power Macs' 16x SuperDrives can burn up to 8.5GB on a single digital video disc, Apple said.
Separately, the company announced lower prices for its wide-screen, flat-panel Cinema Displays. The 20-inch model is now priced at $799, while the 23-inch one will sell for $1,499. The 30-inch Cinema HD Display is available for $2,999.