Runs Mountain Lion (10.8)Doesn't Run Mountain Lion (10.8)Mountain Lion (10.8) support is unknown
Runs Lion (10.7)Doesn't Run Lion (10.7)Lion (10.7) support is unknown
Runs iOS 6Doesn't Run iOS 6iOS 6 support is unknown
Runs iOS 5Doesn't Run iOS 5iOS 5 support is unknown
Options & Info
Created by Anonymous on 31 Oct 2012 12:25.
Last updated by swordzman0611 on 14 Aug 2016 05:30.
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iMac 20" (Late 2006)
![iMac 20" (Late 2006)](http://osx.wdfiles.com/local--resized-images/apple-device:82/class="device-image"/medium.jpg)
| Device type | iMac |
|---|---|
| Model identifier | iMac4,1 |
| Release year | 2006 |
| Processor | 2.00 GHz Intel Core2 Duo, option to 2.33 |
| Display | 20" |
Notes
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)
History:
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.
[[/module]]
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