Inside the new 17-inch iMac you get the 1.25GHz PowerPC G4 with Velocity Engine, 256MB of PC2700 (333MHz) Double Data Rate SDRAM main memory (expandable up to 1GB), NVIDIA GeForce FX 5200 Ultra graphics with 64MB of DDR SDRAM, and an Ultra-ATA/100 80GB hard disk that dishes out data at 7200 rpm.
The 15-inch iMac features a 1GHz PowerPC G4 processor, Combo drive (DVD-ROM/CD-RW), and NVIDIA GeForce 4 MX graphics with 32MB of DDR SDRAM. Apart from that, the 15-inch iMac features just about everything the 17-inch model comes with, including built-in 10/100BASE-T Ethernet and 56K V.92 modem, two FireWire 400 ports, three USB 2.0 ports, two USB 1.1 ports (on keyboard), VGA output port, S-video and composite video output, headphone jack, Apple speaker minijack and audio line in jack. You can also enjoy the freedom of wireless computing: both iMac models come AirPort Extreme-ready, and you can add an internal Bluetooth module as a build-to-order option. [Discovered via: MacRumors]