Currently Optimus Nvidia graphics technology is only used in the notebook alone. This technology is promising tools to improve graphics performance, and is designed to save battery life notebook.
With this, Optimus allows users to install two graphics in a notebook automatically. When you wish to save the battery, users can switch to Intel's integrated graphics card.
As quoted from VRzone, Wednesday (04/27/2011), Optimus technology will support the Intel Express chipset H67/61 and Z68 at the Sandy Bridge processor-based mainboard. Optimus technology also will improve the performance of video transcoding by using technology Sandy Bridge Quick Sync.
Of course, the mainboard must be through the BIOS and graphics driver update Optimus technology first.