====== About iMac 2006 ======
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Was the first [[iMac]] model with Intel CPU (Central Processor Unit). iMac models featured either a white polycarbonate enclosure or an aluminum enclosure. At the Macworld Conference and Expo on January 10, 2006, Steve Jobs announced that the new [[iMac]] would be the first [[Macintosh]] to use an [[Intel CPU]], the Core Duo. The introduction of the new iMac along with the Intel-based [[MacBook Pro]] was the start of the Mac transition to [[Intel]] processors. In the following months, the other Mac products followed, including the introduction of the Intel Core-powered [[Mac mini]] on February 28, 2006, the MacBook consumer line of laptop computers on May 16, 2006, the [[Mac Pro]] on August 7, 2006, and the Xserve in November 2006, completing the transition. The features, price, and case design remained unchanged from the [[iMac G5]]. The processor speed, however, according to tests run by Apple using SPEC, was declared to be two to three times faster than the [[iMac G5]]. In early February 2006, Apple confirmed reports of video display problems on the new Intel-based iMacs. When playing video on Apple's Front Row media browser, some 20-inch iMacs (those built-to-order with upgraded video cards) showed random horizontal lines, ghosting, video tearing and other problems. The problem was fixed with a software update. In early September 2006, Apple introduced a new version of the iMac including a Core 2 Duo chip and a lower price. Apple added a new 24-inch model with IPS-display and a resolution of 1920 × 1200 (WUXGA), making it the first iMac to be able to display 1080p content in its full resolution, and a VESA Flat Display Mounting Interface. Except for the 17-inch 1.83 GHz processor model, this version also included an 802.11n draft card.
Essentials
Family: iMac/eMac
Codename: ?
Gestalt ID: 406
Minimum OS: 10.4.7
Maximum OS: 10.7.5
Introduced: September 2006
Terminated: August 2007
Processor
CPU: Intel Mobile Core 2 Duo (T7xxx)
CPU Speed: 1.83/2.0/2.16 GHz
CPU Cores: 2
FPU: integrated
Bus Speed: 667 MHz
Register Width: 64-bit
Data Bus Width: 64-bit
Address Bus Width: 64-bit
Level 1 Cache: 32 kB data, 32 kB instruction
Level 2 Cache: 4 MB on-processor
ROM: EFI
RAM Type: PC2-5300 DDR2 SDRAM
Minimum RAM Speed: 667 MHz
RAM slots: 2
Maximum RAM: 3.0 GB
Video
Screen: 17/20/24" LCD
GPU: ATI Radeon X1600 (PCI Express)
VRAM: 128 MB (GDDR3)
Max Resolution: 1440x900/1680x1050/1920x1200
Video Out: mini-DVI
Camera: iSight
Storage
Hard Drive: 160/250 GB 7200 RPM
ATA Bus: Serial-ATA
Optical Drive: 24x/24x/8x/8x/4x/2.4x CD-RW/DVD±RW/DVD+R DL
Input/Output
USB: 3 2.0
Firewire: 2
Audio Out: stereo 24 bit mini, Optical S/PDIF
Audio In: stereo 24 bit mini, Optical S/PDIF
Speaker: stereo
Microphone: mono
Networking
Ethernet: 10/100/1000Base-T
Wi-Fi: 802.11b/g
Bluetooth: 2.0+EDR
Miscellaneous
Power: 180 Watts
Dimensions: 16.9" H x 16.8" W x 6.8" D
Weight: 15.5 lbs.
Notes
The 1.83 GHz model had an Intel Mobile Core 2 Duo T5600 CPU with 2 MB of L2 cache, used the Intel Intel GMA950 graphics chipset,
had a 24x/24x/16x/8x CD-RW/DVD-ROM "Combo" drive, did not include Bluetooth, and supported a maximum of 2GB of RAM.
Though reported as a 64 MB graphics system, the chipset actually used a minimum of 80 MB of RAM,
resulting in a maximum of 432 MB of RAM available for system use in the base system.
The 20" model had the following dimensions and weight: 18.6" H x 19.4" W x 7.4 D, 22 lbs.
The 24" model used an NVIDIA GeForce 7300GT graphics card with 128 MB of VRAM
(a 256MB NVIDIA GeForce 7600 GT was available as a BTO option), and had one FireWire 400 and one FireWire 800 port.
It had the following dimensions and weight: 20.6" H x 22.6" W x 8.1 D, 24.7 lbs.
====== History ======
* 2020 Bought it from local private person for 70eur.
* 2022.05.21 Bought Intel Core 2 Duo T7600 CPU Dual-Core 2.33GHz 4MB 667 MHz Socket M CPU from ebay for €36.26 total.
* 2022.08.22 Done cpu and firmware upgrade, also fixed broken speakers with glue.
====== SSD Speed ======
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====== CPU Upgrade possibilities ======
It’s possible to upgrade these with up to a 2.33 GHz Core 2 Duo Merom CPU. These are your Core 2 Duo CPU upgrade options:
* 2.0 GHz Intel T7200, 4 MB cache
* 2.16 GHz Intel T7400, 4 MB cache
* 2.33 GHz Intel T7600, 4 MB cache
Only consider the 2.0 GHz T7200 if you have a Core Duo iMac or the 1.83 GHz Core 2 Duo model. With its larger cache and more efficient CPU, it will give a modest performance boost for about $3 shipped – about 7% better than 2.0 GHz Core Duo and 15% better than 1.83 GHz. Be sure to get good thermal paste, such as Arctic Silver.
The 2.16 GHz T7400 provides maybe 5% more overall power than the T7200, and you can often find it for under $9 shipped on eBay. Definitely worth it for the 1.83 GHz iMacs and the 2.0 GHz Core Duo – maybe not worth the effort on the 2.0 GHz Core 2 iMac.
For the maximum speed on these iMacs, you’re looking at the 2.33 GHz T7600, which provides a 16% speed boost for the 2.0 GHz Core 2 model and over 25% for the 1.83 GHz iMacs. Again, it may not be as worthwhile for the 2.16 GHz model, as this is only about a 6% difference in benchmark scores.
===== Tutorial =====
* [[https://www.ifixit.com/Guide/iMac+Intel+20-Inch+EMC+2105+and+2118+CPU+Replacement/35350|iMac CPU Upgrade howto]]
====== Firmware Upgrade possibilities ======
Note that upgrading a Core Duo iMac with a Core 2 Duo CPU does not allow it to use more than 2 GB of RAM or install Mac OS X 10.7 Lion unless you update the EFI firmware to version 5,1. Be sure to install the Core 2 Duo CPU before performing the firmware update, which makes it the equivalent of a native Core 2 Duo iMac, so you can install 4 GB of memory and/or OS X Lion.
===== Tutorial =====
First up, you need to upgrade the firmware on you **iMac4,1** to **iMac5,1**. Unzip [[https://github.com/jasoncopp/imac4-1-to-windows10x64/blob/master/bios-upgrade/iMac41-iMac51%20Firmware%20Tool.zip|this file]] in a location of your choice on your iMac in MacOS:
__Unfortunately this tool no longer works properly as the URL to download the firmware has been changed. It gives "error 5530". However, here is a workaround from the source forum; it's pretty straightforward.
__
==== STEP A - Download EFI updates ====
* [[https://github.com/jasoncopp/imac4-1-to-windows10x64/blob/master/bios-upgrade/iMacFirmwareUpdate.dmg|iMacFirmwareUpdate.dmg]]
* [[https://github.com/jasoncopp/imac4-1-to-windows10x64/blob/master/bios-upgrade/iMacFirmwareUpdate1.2.dmg|iMacFirmwareUpdate1.2.dmg]]
==== STEP B - Rename downloaded .dmg files ====
* Efi update 1.1: **iMacFirmwareUpdate.dmg** -> rename to -> **iMacEFIiMac41.dmg**
* Efi update 1.2: **iMacFirmwareUpdate1.2.dmg** -> rename to -> **iMacEFIiMac51.dmg**
==== STEP C - Run iMac41-iMac51 Firmware Tool ====
__Run it as usual. It will report error 5530 as before and it will create on desktop a RamDisk volume. DO NOT EXPULSE IT!__
==== STEP D - Copy files to RamDisk ====
Select "**iMac41-iMac51 Firmware Tool.app**", right click and then click on "**Show packet content**" Copy the following files to "**/Volumes/RamDisk**":
ExtractAndPatchEFIFiles.sh
iMac41EFIUpdater.patch
iMac51EFIUpdater.patch
UpdateEFIiMac41-iMac51.sh
__Also remember to copy the two downloaded .dmg from Apple than you have already renamed: **iMacEFIiMac41.dmg** and **iMacEFIiMac51.dmg**__
==== STEP E - Lets do the Magic ====
Open a terminal and drag and drop on it the **ExtractAndPatchEFIFiles.sh** script. Then run it and wait until everything finish Open a terminal, type sudo and then drag and drop the UpdateEFIiMac41-iMac51.sh script:
sudo /Volumes/Ramdisk/UpdateEFIiMac41-iMac51.sh
Then run it and wait until everything finishes (at the end it should report that return code is 0, which means that everything worked correctly).
==== STEP F - Shutdown ====
Shutdown the iMac Turn it on and keep pressed power button until the iMac light ENDS blinking You will hear a BEEP sound The iMac will start the EFI update (a progress bar should be displayed) Wait the EFI update to complete and….. Voila!
====== SSD Trim support ======
Open the terminal and type the following commands:
cd /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/
sudo cp -pX IOAHCIBlockStorage ~IOAHCIBlockStorage
sudo perl -pi -e \
's|\x41\x50\x50\x4c\x45\x20\x53\x53\x44|\x00\x00\x00\x00\x00\x00\x00\x00\x00|g' \
IOAHCIBlockStorage
sudo rm /System/Library/Caches/com.apple.kext.caches/Startup/Extensions.mkext
sudo touch /System/Library/Extensions/
Reboot
----
Original source of upgrade tutorials can be [[https://github.com/EverlastEngineering/imac4-1-to-windows10x64|found here]]. There are also the tutorial how to install Windows 10 on this iMac.
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