The second demonstration wasn't quite as impressive, since no one removed a GPU from a running system. This time, Lenovo provided a technology demonstration for NVIDIA showing power draw while running various tasks. The test system was an engineering sample 17" notebook, and we weren't given other details other than the fact that it had an Arrandale CPU and some form of Optimus GPU. The Lenovo notebook had a custom application showing laptop power draw, updating roughly once per second. After loading Windows 7, the idle power was shown at 17W. NVIDIA launched a 3D app on the IGP and power draw increased to 32W, but rendering performance was quite slow. Then they launched the same 3D app on the dGPU and power use hit 39W, but with much better 3D performance. After closing the application, power draw dropped right back to 17W in a matter of seconds. At present there is no word on if/when this Arrandale-based laptop will ship, but it's a safe bet that if Lenovo can provide sample engineering hardware they're likely to ship Optimus laptops in the future.
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