ORIGINAL APPLE
COMPATIBILITY:
iMac 21.5"
Model: A1311
Year: 2009 TO 2011
  ; YEAR: 2009 - 3.06GHz Core 2 Duo (E7600)
- Cores: Dual -Core (2)
- Core Name: Wolfdale
- Socket Type: LGA 775 (Socket T)
- EFI Architecture: 64- Bit
YEAR : 2009 - 3.33GHz Core 2 Duo (E8600)
- Cores: Dual-Core (2)
- Core Name: Wolfdale
- Socket Type: LGA 775 (Socket T)
- EFI Architecture: 64-Bit
  ; YEAR: 2010 - 3.06GHz Core i3 (i3-540)
- Cores: Dual-Core (2)
- Core Name: Clarkdale
- Socket Type: LGA 1156 (Socket H)
- EFI Architecture: 64-Bit
YEAR: 2010 - 3.2 GHz Core i3 (I3-550)
- Cores: Dual-Core (2)
- Core Name: Clarkdale
- Socket Type: LGA 1156 (Socket H)
- EFI Architecture: 64-Bit
YEAR: 2010 - 3.6 GHz Core i5 (I5-680)
- Cores: Dual-Core (2)
- Core Name: Clarkdale
- Socket Type: LGA 1156 (Socket H)
- EFI Architecture: 64-Bit
YEAR: MID-2011 - 2.5 GHz Core i5 (i5-2400S)
- Cores: Quad-Core (4)
- Core Name: Sandy Bridge
- Socket Type: LGA 1155 (Socket H2)
- EFI Architecture: 64-Bit
YEAR: MID-2011-2.7 GHz Core i5 (I5-2500S)
- Cores: Quad-Core (4)
- Core Name: Sandy Bridge
- Socket Type: LGA 1155 (Socket H2)
- EFI Architecture: 64-Bit
YEAR: MID-2011 - 2.8 GHz Core i7 (I7-2600S)
- Cores: Quad-Core (4)
- Core Name: Sandy Bridge
- Socket Type: LGA 1155 (Socket H2)
- EFI Architecture: 64-Bit
YEAR: LATE-2011- 3.1 GHz Core i3 (I3-2100)
- Cores: Quad-Core (4)
- Core Name: Sandy Bridge
- Socket Type: LGA 1155 (Socket H2)
- EFI Architecture: 64-Bit