The macbookpro was introduced 2006 amd replaced the powerbook G4 with an intel proecessor and with 13- and 15-inch screens. A 17-inch version was available in the first and second generation, but not in the third.
The macbookpro second generation, known as the "unibody" model, has a more tapered design and a casing made from a single block of aluminum.
The most substantial differences in the third generation macbookpro are the fitting of a significantly higher resolution retina display, the elimination of the optical drive, and replacement of hard disk drives with solid-state drives.
2016 Apple announced new fourth-generation 13 and 15-inch macbookpro models. The models introduce the touch bar, a multi-touch enabled oled strip built into the top of the keyboard, replacing the function keys. They also include a sapphire-glass covered touch id sensor at the right end of the touch bar. The enclosure continues to be an all-metal unibody construction with significant reduction in volume and weight. All ports have been replaced with either two or four thunderbolt 3 ports, any of which can be used for charging, and a standard 3.5mm headphone jack.
The models also introduce a "second-generation" butterfly mechanism keyboard. The fourth generation 13-inch model has a trackpad that is 46% larger than its predecessor while the 15-inch model has a trackpad twice as large as the previous iteration.
Apple also introduced a new lower-end 13-inch model which lacks the touch bar in favor of function keys and has only two Thunderbolt 3 ports.
Minimum OS: 10.4.4
Maximum OS: 10.6.8
Introduced: January 2006
CPU: Intel Core Duo (T2xxx)
CPU Speed: 1.83/2.0/2.16 GHz
CPU Cores: 2
Bus Speed: 667 MHz
Register Width: 32-bit
Data Bus Width: 32-bit
Address Bus Width: 32-bit
Level 1 Cache: 32 kB data, 32 kB instruction
Level 2 Cache: 2 MB on-processor
ROM: 1 MB ROM + 3 MB toolbox ROM loaded into RAM
RAM Type: PC2-5300 SO-DIMM
MinRAM S peed: 667 MHz
Onboard RAM: 0 MB
RAM slots: 2
Maximum RAM: 2 GB
Expansion Slots: 1 ExpressCard/34
Screen: 15.4" active matrix TFT
GPU: ATI Mobility Radeon X1600
VRAM: 128/256 MB GDDR3
Max Resolution: 1440x900
Video Out: dual-link DVI
Hard Drive: 80/100 GB 5400 RPM (w/SMS) (120 GB 5400 rpm or 100 GB 7200 rpm BTO)
ATA Bus: Serial-ATA
Optical Drive: 24x/24x/10x/8x/4x/4x CD-RW/DVD±RW
USB: 2 2.0
Audio Out: stereo 24 bit mini, Optical S/PDIF
Audio In: stereo 24 bit mini, Optical S/PDIF