The MacBook Air "Core i7" 1.7 13-Inch (Mid-2013/Haswell) is a "build-to-order" configuration of the MacBook Air "Core i5" 1.3 13-Inch (Mid-2013/Haswell), but is also documented as a separate model for convenience. Apart from the processor and its larger L3 cache, these two models are identical.
The Apple MacBook Air "Core i7" 1.7 13-Inch (Mid-2013/Haswell) is powered by a 22-nm "Haswell" 1.7 GHz Intel "Core i7" processor (4650U), featuring two independent processor "cores" on a single chip, a 4 MB shared level 3 cache, 4 GB of onboard 1600 MHz LPDDR3 SDRAM (upgradable to 8 GB at purchase, but not later), 128 GB or 256 GB of PCIe-based flash storage, and an "integrated" Intel HD Graphics 5000 processor that shares system memory.
This is all enclosed in a slim (0.11-0.68 inch), 2.96-pound aluminum case with an integrated 720p "FaceTime HD" webcam, a backlit full-size keyboard, and a 13.3-inch widescreen TFT LED-backlit active-matrix "glossy" display (1440x900 native resolution).
Connectivity includes 802.11ac Wi-Fi, Bluetooth 4.0, analog audio out, a "Thunderbolt" port, two USB 3.0 ports, and an SDXC-capable SD card slot. It lacks an internal Ethernet port, although a US$29 external Thunderbolt adapter was available.
Compared to its predecessor, this model has a virtually identical external enclosure but incorporates a far more efficient processor and architecture, leading to significantly longer battery life. It also offers faster graphics (which use more system memory), faster storage, and faster Wi-Fi.