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A comment on Buying a laptop, check if it has nVidia Optimus, its purpose is infuriate you. Parent comment

Re:Buying a laptop, check if it has nVidia Optimus, its purp... by _delirium on Saturday January 25, 2014 @09:45AM (#7120895)
Doing a little searching, it seems it might be tied to the hardware as well, not just the OSX version (not sure if that's a real hardware limitation or a driver issue though). The dual-GPU MacBook Pros from mid-2010 onwards have "automatic graphics switching" that does it on the fly: http://support.apple.com/kb/HT4110

You're right that the 2008/09 models required logging out/in to switch manually; I hadn't realized that: http://support.apple.com/kb/HT3207

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Re:Buying a laptop, check if it has nVidia Optimus, its purp... by fatrachet on Saturday January 25, 2014 @10:08AM (#7120962)
There is a OSX tool called gfxCardStatus that can switch GPUs without logging out on the 08 and 09 models, works great on my 09 MBP, so it only seems to be a driver issue not a hardware limitation.
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