Other frameworks that cause an automatic switch include OpenGL, OpenCL, Quartz Composer, and CoreGraphics. The reason is that Apple's system automatically switches to the higher-powered GPU when apps use certain graphics-related frameworks, like CoreAnimation. When Apple first introduced automatic switching with the Sandy Bridge-based MacBook Pros in 2010, users discovered that some apps that shouldn't require the power of a discrete GPU were in fact causing OS X to switch anyway. It was merely a side effect of Apple's implementation of automatic switching between integrated graphics and the discrete NVIDIA GeForce GT 650M GPU.
The issues we ran into that caused our less-than-stellar battery life the first time around were actually nothing new. To achieve this, we overrode Apple's automatic graphics switching using the donation-ware app gfxCardStatus to force OS X to rely solely on Intel's integrated HD4000 GPU. But we've been using the Retina MacBook Pro a little more since our review published a couple of weeks ago, and have discovered that the massive 95Whr battery is actually capable of lasting at least 8 hours or more. Despite the larger battery, though, we were a little disappointed in the battery life we experienced while reviewing it, which was a half hour or more shy of Apple's promised 7 hours. The Retina MacBook Pro eschews spinning mechanical drives-both optical and magnetic varieties-for solid state flash and tons of extra battery.
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