The MacBook Pro "Core i7" 2.9 13-Inch (Mid-2012/USB 3.0) featured 
a 22 nm "Ivy Bridge" 2.9 GHz Intel "Core i7" processor (3520M), with 
two independent processor "cores" on a single silicon chip, 
a 4 MB shared level 3 cache, 
8 GB of 1600 MHz DDR3L SDRAM (PC3-12800) installed in pairs (two 4 GB modules), 
a 500 GB Serial ATA (5400 RPM) hard drive, 
an 8X DL "SuperDrive", 
an "integrated" Intel HD Graphics 4000 graphics processor that shares system memory, 
an integrated 720p FaceTime HD webcam, and 
an LED-backlit 13.3" widescreen TFT active-matrix "glossy" display (1280x800 native resolution).

Connectivity includes 
AirPort Extreme (802.11a/b/g/n), 
Bluetooth 4.0, 
Gigabit Ethernet, 
a Firewire "800" port, 
two USB 3.0 ports, 
a "Thunderbolt" port, audio in/out, and 
an SDXC card slot.

This model uses a "Unibody" aluminum case design 
-- milled from a single piece of aluminum 
-- and has a backlit keyboard, 
a "no button" glass "inertial" multi-touch trackpad, and 
a non-swappable battery design.

Compared to its predecessor, this model essentially is identical externally with the exception of the aforementioned USB 3.0 ports. 

Internally, however, it has a faster processor, architecture, graphics, and RAM.

Please note that stock images are used.