Apple 27" iMac (Late 2009); iMac10,1 (Core 2 Duo) iMac11,1 (Core i5, i7) Installation Guides & Specifications

Upgrading theApple 27” iMac (Late 2009) RAM is very easy. Other upgrades or repair like the Hard Drive or the Optical Drive are a bit more advanced but still manageable. All You'll need is some simple tools, and the correct parts. We then urge you to follow the videos or the Apple manual provided on the links below.

Please see our Apple RAM Memory for iMac 27" (Late 2009) page to locate your  Apple compatible RAM upgrade for your iMac

Please see our Hard Drive  for iMac 27" (Late 2009) page to locate your   Apple compatible Hard Drive upgrades for your iMac

Please see our SSD  for iMac 27" (Late 2009) page to locate your   Apple compatible SSD upgrades for your iMac

Apple User Guides for the Apple iMac 27" (Late 2009)

iMac: How to remove or install memory Learn how to remove or install memory in your iMac computer on the Apple support page.

OWC Video Installation Guide for Apple 27” iMac (Late 2009):

Memory Install Video

Recommended Tools for the RAM upgrade:

-   #2 Philips Screwdriver

Add a second hard drive or SSD easily with the OWC Data Doubler. Here's an instructional video from OWC:

Data Doubler Install Video

Use the Optical Drive install videos below for iMac 27" (Late 2009) to install a DataDoubler mounted drive:

Optical Install Video

Recommended Tools for the Data Doubler/Optibay upgrade:

-  Heavy-duty Suction Cups 
-  Newer Technology 14 Piece Tool Set

Here is how to fix or upgrade the main Hard Drive:

NewerTech AdaptaDrive. Drive Install Video 

OWC's step-by-step video of how to install a drive in a NewerTech AdaptaDrive. 

OWC Skill Level: "Easy" | Duration: 3:00|

Hard Drive Installation Video

Before you replace your original Hard Drive you need to be aware of the heat sensor issue, if you're not have a look at this website.

As explained you have 2 options to fix this:
- Software fix with HDD Fan Control
- Hardware fix with a OWC Heat Sensor DIY kit

Recommended Tools for the HDD/SSD upgrade:

-  Heavy-duty Suction Cups
- Newer Technology 14 Piece Tool Set
- 2.5" to 3.5" adapter - for SSD installation only

- External Hard Drive Enclosure - Convert your existing drive into an external one 

First make sure you understand the heat sensor issue mentioned above.

Here is some detailed specifications as well as direct link to available upgrades: