macOS

Old Macs - CPU vs EFI / 64 or 32?

Introduction

Check the table below to see what are the specs of your old Mac. Macs with a 32-bit CPU and a 32-bit EFI/Boot can only boot 32-bit OSes.

Macs with a 64-bit CPU and a 64-bit EFI/Boot can boot 32-bit and 64-bit OSes.

To install a 64-bit OS on 32-bit EFI/Boot old Mac check this article.

Specification Table

Mac Processor EFI Boot
iMac Core Duo 1.83 17-Inch 32 32 32
iMac Core Duo 2.0 20-Inch 32 32 32
iMac Core Duo 1.83 17-Inch (IG) 32 32 32
iMac Core 2 Duo 1.83 17-Inch (IG) 64 32 32
iMac Core 2 Duo 2.0 17-Inch 64 32 32
iMac Core 2 Duo 2.16 20-Inch 64 32 32
iMac Core 2 Duo 2.16 24-Inch 64 32 32
iMac Core 2 Duo 2.0 20-Inch (Al) 64 64 32*
iMac Core 2 Duo 2.4 20-Inch (Al) 64 64 32*
iMac Core 2 Duo 2.4 24-Inch (Al) 64 64 32*
iMac "Core 2 Extreme" 2.8 24-Inch (Al) 64 64 32*
iMac Core 2 Duo 2.4 20" (Early 2008) 64 64 32/64
iMac Core 2 Duo 2.66 20" (Early 2008) 64 64 32/64
iMac Core 2 Duo 2.8 24" (Early 2008) 64 64 32/64
iMac Core 2 Duo 3.06 24" (Early 2008) 64 64 32/64
iMac Core 2 Duo 2.66 20" (Early 2009) 64 64 32/64
iMac Core 2 Duo 2.66 24" (Early 2009) 64 64 32/64
iMac Core 2 Duo 2.93 24" (Early 2009) 64 64 32/64
iMac Core 2 Duo 3.06 24" (Early 2009) 64 64 32/64
iMac Core 2 Duo 2.0 20" (Early 2009) 64 64 32/64
iMac Core 2 Duo 3.06 21.5" (Late 2009) 64 64 32/64
iMac Core 2 Duo 3.06 27" (Late 2009) 64 64 32/64
iMac Core i5 2.66 27" (Late 2009) 64 64 32/64
iMac Core i3 3.06 21.5" (Mid-2010) 64 64 32/64
iMac Core i3 3.2 21.5" (Mid-2010) 64 64 32/64
iMac Core i3 3.2 27" (Mid-2010) 64 64 32/64
iMac Core i5 2.8 27" (Mid-2010) 64 64 32/64
MacBook Core Duo 1.83 13" 32 32 32
MacBook Core Duo 2.0 13" (White) 32 32 32
MacBook Core Duo 2.0 13" (Black) 32 32 32
MacBook Core 2 Duo 1.83 13" 64 32 32
MacBook Core 2 Duo 2.0 13" (White/06) 64 32 32
MacBook Core 2 Duo 2.0 13" (Black) 64 32 32
MacBook Core 2 Duo 2.0 13" (White/07) 64 64 32*
MacBook Core 2 Duo 2.16 13" (White) 64 64 32*
MacBook Core 2 Duo 2.16 13" (Black) 64 64 32*
MacBook Core 2 Duo 2.0 13" (White-SR) 64 64 32*
MacBook Core 2 Duo 2.2 13" (White-SR) 64 64 32*
MacBook Core 2 Duo 2.2 13" (Black-SR) 64 64 32*
MacBook Core 2 Duo 2.1 13" (White-08) 64 64 32*
MacBook Core 2 Duo 2.4 13" (White-08) 64 64 32*
MacBook Core 2 Duo 2.4 13" (Black-08) 64 64 32*
MacBook Core 2 Duo 2.0 13" (Unibody) 64 64 32*
MacBook Core 2 Duo 2.4 13" (Unibody) 64 64 32*
MacBook Core 2 Duo 2.0 13" (Wh-09) 64 64 32*
MacBook Core 2 Duo 2.13 13" (Wh-09) 64 64 32*
MacBook Core 2 Duo 2.26 13" (Uni-09) 64 64 32*
MacBook Core 2 Duo 2.4 13" (Mid-2010) 64 64 32*
MacBook Air Core 2 Duo 1.6 13" (Orig) 64 32 32
MacBook Air Core 2 Duo 1.6 13" (NVI) 64 64 32*
MacBook Air Core 2 Duo 1.86 13" (NVI) 64 64 32*
MacBook Air Core 2 Duo 1.86 13" (09) 64 64 32*
MacBook Air Core 2 Duo 2.13 13" (09) 64 64 32*
MacBook Air Core 2 Duo 1.4 11" (10) 64 64 32*
MacBook Air Core 2 Duo 1.86 13" (10) 64 64 32*
MacBook Pro Core Duo 1.83 15" 32 32 32
MacBook Pro Core Duo 2.0 15" 32 32 32
MacBook Pro Core Duo 2.16 15" 32 32 32
MacBook Pro Core Duo 2.16 17" 32 32 32
MacBook Pro Core 2 Duo 2.16 15" 64 32 32
MacBook Pro Core 2 Duo 2.33 15" 64 32 32
MacBook Pro Core 2 Duo 2.33 17" 64 32 32
MacBook Pro Core 2 Duo 2.2 15" (SR) 64 64 32*
MacBook Pro Core 2 Duo 2.4 15" (SR) 64 64 32*
MacBook Pro Core 2 Duo 2.4 17" (SR) 64 64 32*
MacBook Pro Core 2 Duo 2.4 15" (08) 64 64 32/64
MacBook Pro Core 2 Duo 2.5 15" (08) 64 64 32/64
MacBook Pro Core 2 Duo 2.5 17" (08) 64 64 32/64
MacBook Pro Core 2 Duo 2.4 15" (Uni) 64 64 32/64
MacBook Pro Core 2 Duo 2.53 15" (Uni) 64 64 32/64
MacBook Pro Core 2 Duo 2.66 17" (Uni) 64 64 32/64
MacBook Pro Core 2 Duo 2.66 15" (Uni) 64 64 32/64
MacBook Pro Core 2 Duo 2.26 13" (SD) 64 64 32/64
MacBook Pro Core 2 Duo 2.53 13" (SD) 64 64 32/64
MacBook Pro Core 2 Duo 2.53 15" (SD) 64 64 32/64
MacBook Pro Core 2 Duo 2.66 15" (SD) 64 64 32/64
MacBook Pro Core 2 Duo 2.8 15" (SD) 64 64 32/64
MacBook Pro Core 2 Duo 2.8 17" (09) 64 64 32/64
MacBook Pro Core 2 Duo 2.4 13" (10) 64 64 32/64
MacBook Pro Core 2 Duo 2.66 13" (10) 64 64 32/64
MacBook Pro Core i5 2.4 15" (10) 64 64 32/64
MacBook Pro Core i5 2.53 15" (10) 64 64 32/64
MacBook Pro Core i7 2.66 15" (10) 64 64 32/64
MacBook Pro Core i5 2.63 17" (10) 64 64 32/64
Mac mini Core Solo 1.5 32 32 32
Mac mini Core Duo 1.66 32 32 32
Mac mini Core Duo 1.83 32 32 32
Mac mini Core 2 Duo 1.83 64 64 32*
Mac mini Core 2 Duo 2.0 64 64 32*
Mac mini Core 2 Duo 2.0 (Early 2009) 64 64 32*
Mac mini Core 2 Duo 2.26 (Late 2009) 64 64 32*
Mac mini Core 2 Duo 2.53 (Late 2009) 64 64 32*
Mac mini Core 2 Duo 2.53 (Server) 64 64 32*
Mac mini Core 2 Duo 2.4 (Mid-2010) 64 64 32/64
Mac mini Core 2 Duo 2.66 (Server) 64 64 64/32
Mac Pro Quad Core 2.66 (Original) 64 32 32
Mac Pro Eight Core 2.8 (2008) 64 64 32/64
Mac Pro Quad Core 2.66 (2009) 64 64 32/64
Mac Pro Eight Core 2.26 (2009) 64 64 32/64
Mac Pro Quad Core 2.8 (2010) 64 64 64/32
Mac Pro Six Core 3.33 (2010) 64 64 64/32
Mac Pro Eight Core 2.4 (2010) 64 64 64/32
Mac Pro Twelve Core 2.66 (2010) 64 64 64/32
Mac Pro Quad Core 2.8 (Server) 64 64 64/32
Mac Pro Six Core 3.33 (Server) 64 64 64/32
Xserve Xeon 2.0 Quad Core 64 32 32
Xserve Xeon 2.8 Quad Core 64 64 32/64
Xserve Xeon Nehalem 2.26 Quad Core 64 64 32/64

* These models are believed to be hardware capable of booting 64-bit OSes, but it appears that they have been blocked in EFI from doing so.

 

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