Since sometime in late 2008, Apple’s 17” and select 15” Macbook Pro models have included not one but two graphics processors, the nVidia 9400M and 9600M GT. It is my understanding that by default the laptop uses the integrated lower-wattage 9400M, which includes 256MB RAM and helps extend battery life. It will run the main laptop display and push an external display as well. The additional nVidia 9600M GT graphics option is actually a discrete internal PCI-E card featuring 512MB of RAM and offer
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