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Other than to tout Pine Trail compatibility, Nvidia hasn't publicly explained any technical differences between the original Ion and the next-generation version that's now shipping. However, the Ion 2 is said to be compatible with the company's Optimus technology. As explained in our previous coverage, here, Optimus consists of special Windows 7 drivers (plus a matching control panel) that can save battery power by switching to discrete graphics only for games and other selected applications.
The original Ion supported DDR3 memory interfaces with frontside bus speeds of up to 1066MHz. Graphically, the Ion is said to support DirectX 10, offer resolutions up to 2560 x 1600 pixels, provide 1080p HD video playback, and deliver HDMI, VGA, DisplayPort, and dual-link DVI video outputs.

Shuttle recently introduced another ultra-thin PC that runs on the Atom D510, called the X5012. An all-in-one design equipped with a 15.6-inch touchscreen, the X5012 lacks Ion-based graphics.
Further information
The Shuttle Barebone XS35 will be available in stores in the second quarter, with pricing yet to be determined, says Shuttle. More information should eventually appear on Shuttle's Barebone page, here.