On May 17, 2010, at 6:41 PM, Dave Keck wrote:

> The user's Energy Saver settings affects which card is used (better
> battery life vs. higher performance.) Not sure if that helps you
> though, since changing the value on my system requires logging out.

According to this:
  
http://codykrieger.com/blog/2010/05/gfxcardstatus-and-2009-macbook-pros-with-nvidia-94009600-gpus/

you *can* switch the 9600/9400 live without logging out/back in -- though one 
expects that Apple did not enable this feature for good reason...


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