1 (2 Cores)64-Bit
60816616
23664468
25914990
26394943
5551142
1.3 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 2.6 GHz for this model) -- and "Hyper Threading" -- which allows the system to recognize four total "cores" or "threads" (two real and two virtual).

Also see: How fast are the "Mid-2013" MacBook Air models compared to one another and to earlier MacBook Air models? How fast are these models compared to the 13-Inch "Early 2013" Retina Display MacBook Pro?
2.6 GHz1.7 GHz (Core i7)
SolderedIntegrated
OPI*1.3 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.
4 GB8 GB*
Details:*4 GB of RAM is onboard. It could be upgraded at the original time of purchase to 8 GB as a US$100 option, but it cannot be upgraded later.

Also see: Actual Max RAM of All G3 & Later Macs.
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

PORTS:

 1 (Thunderbolt) None
Details:Thunderbolt is backwards-compatible with Mini DisplayPort-equipped displays as well as adapters that are compatible with Mini DisplayPort (DVI, VGA, dual-link DVI and HDMI). It also can support other peripherals that use the Thunderbolt standard, which provides a maximum theoretical 10 Gbps of bandwidth in both directions.

Also see: What is "Thunderbolt"? Is it an industry standard? What advantages does it offer? Are there any disadvantages?
 None None
 None None
 2 (3.0) None
Details:Two USB 3.0 ports (up to 5 Gbps), no Firewire ports.

Also see: What is the best USB 2.0 or USB 3.0 hub to use with the MacBook Air while traveling?
 None None
Details:No internal modem or Ethernet. External Apple Thunderbolt to Gigabit Ethernet adapter offered for US$29.
 None None
 2 (Internal) None
 None* 1*
 None None
 N/A 1