Unlike earlier models, where every USB port could provide 500 mA of power, only a single high-powered device can be attached to the USB ports, and software will enable one of its downstream ports to supply 500 mA of power. These models shipped with Mac OS X 10.4.9 Tiger and can run OS X 10.11 El Capitan.
The 17″ MBP has 3 USB 2.0 ports, one more than the 15″ MBP offers. This model includes built-in dual-DVI support for Apple’s 30″ Cinema Display and an ExpressCard/34 slot (replacing the older PC Card). Note that the built-in display is only capable of 18-bit color, not the full 24-bit color you might expect. And they run their CPUs a tiny bit faster. 2 GB of RAM is standard, with a 6 GB ceiling (up from 3 GB). The included Nvidia GeForce 8600M GT graphics, an improvement over the ATI Mobility Radeon X1600. The 15″ was Apple’s first notebook with LED backlighting, and this was the first time Apple offered a 1920 x 1200 screen for the 17″ model. Both use Intel’s Santa Rosa chipset and an 800 MHz system bus (up from 667 MHz). The Mid 2007 MacBook Pro came in two sizes.
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