The MacBook Pro "Core i7" 3.1 13-Inch (Early 2015 Retina Display) originally was a "configure-to-order" configuration for both theMacBook Pro "Core i5" 2.7 13-Inch (Early 2015 Retina Display)andMacBook Pro "Core i5" 2.9 13-Inch (Early 2015 Retina Display), but also is documented as a separate model for reader convenience. Starting on October 27, 2016, it only is a CTO option for the MacBook Pro "Core i5" 2.7 13-Inch (Early 2015 Retina Display).The processor (and the corresponding larger level 3 cache), are the only substantial differences between this model and its stock compatriots.
The MacBook Pro "Core i7" 3.1 13-Inch (Early 2015 Retina Display) features a 14 nm "Broadwell" 3.1 GHz Intel "Core i7" processor (5557U), with dual independent processor "cores" on a single silicon chip, a 4 MB shared level 3 cache, 8 GB ofonboard1866 MHz LPDDR3 SDRAM (which could be upgraded to 16 GB at the time of purchase, butcannotbe upgraded later), 512 GB of 4 Lane PCIe-based flash storage, and an integrated Intel Iris Graphics 6100 graphics processor that shares memory with the system. It also has an integrated 720p FaceTime HD webcam, and a high-resolution LED-backlit 13.3" widescreen 2560x1600 (227 ppi) "Retina" display in a case that weighs just less than 3.5 pounds (1.58 kg). It does not have an internal optical drive.
Connectivity includes 802.11ac Wi-Fi, Bluetooth 4.0, two USB 3.0 ports, two "Thunderbolt 2" ports, an HDMI port, an audio in/out port, and an SDXC card slot.
In addition, this model has a backlit keyboard, a clever haptic-capable "Force Touch" trackpad.
Compared to itspredecessor, this model looks nearly identical externally, but it has a more advanced processor and architecture, more advanced graphics processor, faster RAM, a faster SSD, and a higher capacity battery as well as the aforementioned more advanced "Force Touch" trackpad.
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