eBay

2.8GHz Intel Core i7

Keyboard is defective. Some keys are NOT functional.

16GB RAM

500GB SSD

macOS 10.13 High Sierra

Good battery. Charger is not included.

May show sings of wear (please refer to pictures).

This model is powered by a 22 nm, 64-bit "Fourth Generation" Intel Mobile Core i7 "Haswell/Crystalwell" (I7-4980HQ) processor which includes four independent processor "cores" on a single silicon chip. Each core has a dedicated 256k level 2 cache, shares 6 MB of level 3 cache, and has an integrated memory controller (dual channel).

This system also supports "Turbo Boost 2.0" -- which "automatically increases the speed of the active cores" to improve performance when needed (up to 4.0 GHz for this model) -- and "Hyper Threading" -- which allows the system to recognize eight total "cores" or "threads" (four real and four virtual).

This model has dual graphics processors -- a NVIDIA GeForce GT 750M with 2 GB of dedicated GDDR5 SDRAM and an Intel Iris Pro 5200 with 128 MB of "Crystalwell" embedded DRAM (and shared system memory). The system automatically switches between graphics systems based on use (when applications use OpenGL, Core Graphics or other graphically demanding technologies, the system will use the dedicated NVIDIA graphics, otherwise it will use the integrated Intel graphics to conserve battery life).

This model has a 15.4" color widescreen LED-backlit display with IPS technology with a 2880 by 1800 native resolution at 220 ppi (178-degree viewing angle). It also supports scaled resolutions of 1920 by 1200, 1680 by 1050, 1280 by 800, and 1024 by 640.

This model supports a simultaneous maximum resolution up to 2560x1600 on two external displays via Thunderbolt. Alternately, it can support a single display up to 2560x1600 via Thunderbolt and a single 1080p display at up to 60 Hz, 3840x2160 at 30 Hz, or 4096x2160 at 24 Hz via HDMI.