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[* black] Left: 15" Unibody logic board
[* black] Right: 17" Unibody logic board
[* black] What's different? The biggest difference to you is the additional USB port. Oh, and $800.
[* black] The [guide|590|low-end 15" board] that we took apart in October only has 256 MB video memory (Samsung RAM soldered onto the board). The high-end 15" and this 17" have 512 MB video RAM.
[* icon_note] [link|http://s1.guide-images.ifixit.com/igi/KTWAXRyRKDVrjjFH.huge|High-resolution photo] of the logic board.