1.4 GHzCore i5 (I5-4250U)
Details:This model is powered by a 22 nm, 64-bit "Fourth Generation" Intel Mobile Core i5 "Haswell ULT" (I5-4250U) processor which includes two independent processor "cores" on a single silicon chip. Each core has a dedicated 256k level 2 cache, shares 3 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 2.4 GHz for this model) -- and "Hyper Threading" -- which allows the system to recognize four total "cores" or "threads" (two real and two virtual).
2.4 GHz1.7 GHz (Core i7)
SolderedIntegrated
OPI*1.4 GHz (Built-in)
EFI64-Bit
32k/32k x2256k x2, 3 MB (on chip)
LPDDR3 SDRAM*1600 MHz
Details:Ships standard with 4 GB of 1600 MHz "Low Power" LPDDR3 SDRAM onboard.
8 GB8 GB
Details:                     8 GB of RAM is onboard
4 GB*None
HD Graphics 5000Integrated
Details:This model has an Intel HD Graphics 5000 graphics processor that shares memory with the system.
1.5 GB1.5 GB
13.3" Widescreen1440x900
Details:13.3" color widescreen TFT LED-backlit active-matrix "glossy" display with a 1440 by 900 native resolution. Apple reports that it also supports "1280 by 800, 1152 by 720, and 1024 by 640 pixels at 16:10 aspect ratio and 1024 by 768 and 800 by 600 pixels at 4:3 aspect ratio".
Dual/Mirroring*2560x1600 (x2)
Details:*Although Apple only reports that this model can support a single external display up to 2560x1600, Intel reports that this model can simultaneously support two external displays up to 2560x1600 "daisy chained" via Thunderbolt.
128GB SSDN/A
Details:      The MD760LL/A configuration has 128 GB of flash storage
ProprietaryProprietary* (PCIe 2.0 x2)
None*None
NoneNone*
Details:      *No MacBook Air models have an internal Ethernet port. 
802.11ac*4.0
2 (3.0)None
SD Card (SDXC)None
Details:                This model has an SDXC Card slot.
Full-sizeTrackpad (Inertial)
NotebookMacBook Air 13"
MD760LL/A*Mid-2013
A1466 (EMC 2632)MacBookAir6,2
Details:   Please note that these identifiers refer to more than one model.
54 W h Li-Poly*
Details:*Apple originally reported that this model had a built-in 50-watt-hour lithium-polymer battery, but later changed it to correctly note 54-watt-hours. 
X 10.8.4 (12E3067)Current
7 (64-Bit)*10 (64-Bit)*
NoneBoot/Virtualization