MacBook Pro (13-inch, Late 2011)

Model Identifier: MacBookPro8,1
Part Numbers: MD314xx/A, MD313xx/A
Newest compatible operating system: macOS High Sierra 10.13.6

MacBook Pro (15-inch, Late 2011)

Model Identifier: MacBookPro8,2
Part Numbers: MD322xx/A, MD318xx/A
Newest compatible operating system: macOS High Sierra 10.13.6

MacBook Pro (17-inch, Late 2011)

Model Identifier: MacBookPro8,3
Part Number: MD311xx/A
Newest compatible operating system: macOS High Sierra 10.13.6

MacBook Pro (13-inch, Early 2011)

Model Identifier: MacBookPro8,1
Part Numbers: MC724xx/A, MC700xx/A
Newest compatible operating system: macOS High Sierra 10.13.6

MacBook Pro (15-inch, Early 2011)

Model Identifier: MacBookPro8,2
Part Numbers: MC723xx/A, MC721xx/A
Newest compatible operating system: macOS High Sierra 10.13.6

MacBook Pro (17-inch, Early 2011)

Model Identifier: MacBookPro8,3
Part Number: MC725xx/A
Newest compatible operating system: macOS High Sierra 10.13.6