Inside the machine there's a Motorola (nyse: MOT - news - people )-made 1-gigahertz PowerPC processor, an Nvidia (nasdaq: NVDA - news - people ) GeForce4 440 Go graphics processor and a 60-gigabyte hard drive.

FORBES: Magazine Article

Unlike the G3-powered iMac, the Cube uses a top-of-the-range PowerPC G4 processor -- running at either 450MHz or 500MHz -- so there's no skimping on performance.

CNN: Up close and personal with the Mac G4 Cube

The dual-core Power6 chip boasts a top speed of 4.7 gigahertz, double that of IBM's previous Power5 and represents a next generation processor to the PowerPC, the chip that was previously used in Apple's Macintosh computers.

FORBES: Magazine Article

The dual-core Power6 chip boasts a top speed of 4.7 gigahertz, double that of IBM's previous Power5 and represents a next generation processor to the PowerPC, the chip that was previously used in Apple (nasdaq: AAPL - news - people )'s Macintosh computers.

FORBES: IBM Launches Faster, Cheaper Chip