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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.
Intel's Classmate is built around the 90nm Celeron M Ultra Low Voltage 353 processor running at 900MHz. It has a 400MHz frontside bus linking it to the Mobile Intel 915GMS Express chipset, which includes the Intel Graphics Media Accelerator 900 graphics module. Like the OLPC, the Classmate has a moderate 256MB of RAM, but Intel's system has double the solid-state storage capacity of the OLPC XO at 2GB. Again, there's an SD card slot for storage expansion.
In passing, it's worth noting that Intel clearly does not expect the average user to modify or otherwise tinker with the Classmate's innards: to expose the motherboard for the above picture, we had to remove more than 20 screws and detach the screen — a process that took the best part of an hour.
Like the Classmate, the ASUS Eee is built around the 900MHz Intel Celeron M ULV 353 and the 915GMS chipset, although it comes with a more generous 512MB of RAM. The 2G Surf model shown here has 2GB of solid-state storage, although more expensive 4GB and 8GB models are available. As with the other two notebooks, storage expansion via an SD card slot is available.