iMac 20" (Late 2006)

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iMac 20" (Late 2006)

iMac 20" (Late 2006)
Device type iMac
Model identifier iMac4,1
Release year 2006
Processor 2.00 GHz Intel Core2 Duo, option to 2.33
Display 20"

Architecture Details:

  • EFI: 32-bit
  • Graphics: 32-bit?
  • Maximum RAM: 1.5 GB

OS Support:

  • Shipped Mac OS X Tiger 10.4.7 (Intel)
  • Maximum: Current OS X Lion
  • Windows: XP, Vista (32)

This model was announced in September '06 as part of a near-complete update of the entire Mac line (the Mac mini being the exception to this update as it only got a mild speed bump). While Apple heavily touted the Core2 as making Macs 64-bit for the second time in their history, hindsight from later years including teardown revealed that the CPU was only a fragment of a more complex equation; since Apple still used the 945GM logic platform that was designed for 32-bit Pentium 4 CPU's (it used this in early models) AND also used a 32-bit EFI ROM, the Late 2006 lines were a strange hybrid. It didn't help that the 945 logic platforms were found to bear an erratum whereupon 32-bit memory-mapped I/O (MMIO) always occupied space above 3 GB.

As a result of the strange brew, a number of scenarios play out:

  • The system will boot OS X in 32-bit mode only
  • OS X user space apps will run in 64-bit mode
  • It is possible to install 4 GB of RAM, creating a dual-channel configuration as is recommended, but the MMIO bug caps the unit at 3 GB regardless.
  • 64-bit Windows could run with Boot Camp, but is unsupported by Apple
  • Lion is supported, but not Mountain Lion.

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