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The OLPC XO's motherboard, which is built into the back of the screen lid, uses an AMD Geode LX700 processor running at 433MHz. The PCI and memory interfaces (North Bridge) are built into the CPU, as is the graphics controller. The South Bridge chip, which includes controllers for audio, hard disk, USB and power management, is the AMD Geode CS5536. There is 256MB of RAM and 1GB of solid-state storage. Extra storage can be added via the SD card slot.