There's one mini PCI Express and one mini PCI expansion slot and the enclosure also has enough room for a slim-type optical drive. It's not really suitable for gamers though as the graphics are provided by the Intel G31 Express chipset's GMA3100 IGP.
The system measures 18.5" x 9.0" x 0.5" (2.5" at the rear) and together with its 180W AC power adapter it weighs 8.5lbs (3.9kg).
This new generation All-in-One PC in a keyboard not only takes up far less desktop space, but also puts an Intel Core 2 Quad CPU with all its features and performance at your fingertips. The new ZPC-GX31 is a true innovation packing so much power, performance and compatibility inside a normal size keyboard. With features such as Dual Display capabilities, 4GB of DDR2/667MHz RAM, 1 Gigabit LAN and DVI interface you now have a complete personal computer that takes up no more space than a typical keyboard. Simply place it on your desktop, plug in a monitor and you are done!
More info and the ordering page can be found over here. The base configuration is available for as low as $699.