A DDR3 memory module is included with 2 gigabytes of RAM, expandable to 4 gigabytes via two SO-DIMM slots fitted on the side of the unit. A 2.6-gigahertz dual-core Celeron processor from Intel controls CPU with 800 megahertz FSB, alongside Intel's G41 chipset and GMA X4500 graphics card. A single SATA2 hard disk drive provides users with 320 gigabytes of file storage, with a side-mounted Super Multi optical DVD drive for instant movie playback. Video conferencing is fully supported via a high-definition camera and microphone combo, both situated for natural user clarity. The AC1900 also features two sets of twin stereo speakers for sufficient on-board volume output, with six USB 2.0 ports and a 4-in-1 card reader providing maximum external connectivity.