iMac (20-inch, Mid 2009) - Technical Specifications

Size and weight

20-inch iMac

18.5 inches (46.9 cm)
19.1 inches (48.5 cm)
7.4 inches (18.9 cm)
20 pounds (9.1 kg)1


Connections and expansion

  • One FireWire 800 port; 7 watts
  • Total of six USB 2.0 ports: four ports on computer, two ports on wired keyboard


  • Built-in AirPort Extreme Wi-Fi wireless networking (based on IEEE 802.11n draft specification);2 IEEE 802.11a/b/g compatible
  • Built-in 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)


  • Built-in stereo speakers
  • Internal 24-watt digital amplifier
  • Headphone/optical digital audio output (minijack)
  • Audio line in/optical digital audio input (minijack)
  • Built-in microphone
  • Support for Apple Stereo Headset with microphone

Environmental Status Report

  • Arsenic-free display glass
  • BFR-free
  • PVC-free (internal cables)
  • Highly recyclable aluminum and glass enclosures
  • Meets ENERGY STAR 5.0 requirements
  • Rated EPEAT Gold

Acoustic Performance

DECLARED NOISE EMISSIONS in accordance with ISO 9296

  Sound Power Level
LWAd (B)
1 B = 10 dB
Sound Pressure Level
Operator Position
LpAm (dB)
Idle 3.1 19
Hard drive accessing 3.1 20
CD drive accessing 3.3 23
  1. LWAd is the statistical upper-limit A-weighted sound power level (rounded to the nearest 0.1 B).
  2. LpAm is the mean A-weighted sound pressure level measured at the operator position (rounded to the nearest dB).
  3. 1 B (bel) = 10 dB (decibel).


  • Built-in 20-inch (viewable) glossy widescreen TFT active-matrix liquid crystal display
  • Resolution: 1680 by 1050 pixels
  • Millions of colors at all resolutions
  • Typical viewing angle: 
160° horizontal
, 160° vertical
  • Typical brightness: 290 cd/m2
  • Typical contrast ratio: 800:1

Graphics and video support

  • NVIDIA GeForce 9400M graphics processor with 256MB of DDR3 SDRAM shared with main memory3
  • Mini DisplayPort output port with support for DVI, VGA, and dual-link DVI via adapter4
  • Built-in iSight camera
  • Support for extended desktop and video mirroring modes
  • Simultaneously supports full native resolution on the built-in display and up to a 30-inch display (2560 by 1600 pixels) on an external display

Processor and memory

  • One of the following:
    • 2.0GHz Intel Core 2 Duo processor
    • 2.26GHz Intel Core 2 Duo processor
  • 3MB shared L2 cache at full processor speed
  • 1066MHz frontside bus
  • 1GB (one 1GB SO-DIMM) or 2GB (two 1GB SO-DIMMs) of 1066MHz DDR3 SDRAM; two SO-DIMM slots support up to 8GB


Hard drive5

  • 160GB 7200-rpm Serial ATA hard drive5
    • Optional 320GB 7200-rpm Serial ATA hard drive

Optical drive

  • Slot-loading 8x SuperDrive (DVD±R DL/DVD±RW/CD-RW)
  • Writes DVD+R DL and DVD-R DL discs at up to 4x speed
  • Writes DVD-R and DVD+R discs at up to 8x speed
  • Writes DVD-RW discs at up to 6x speed and DVD+RW discs at up to 8x speed
  • Reads DVDs at up to 8x speed
  • Writes CD-R discs at up to 24x speed
  • Writes CD-RW discs at up to 16x speed
  • Reads CDs at up to 24x speed

Electrical and operating requirements

  • Line voltage: 100-240V AC
  • Frequency: 50Hz to 60Hz, single phase
  • Maximum continuous power: 200W
  • Operating temperature: 50° to 95° F (10° to 35° C)
  • Storage temperature: -40° to 185° F (-40° to 85° C)
  • Relative humidity: 5% to 95% noncondensing
  • Maximum altitude: 10,000 feet

What’s in the box

  • iMac
  • Apple Keyboard
  • Mighty Mouse
  • Cleaning cloth
  • Power cord
  • Install/restore DVDs
  • Printed and electronic documentation



2.0GHz Intel Core 2 Duo 2.6GHz Intel Core 2 Duo 2.6GHz Intel Core 2 Duo

L2 cache

3MB shared 3MB shared 3MB shared

Frontside bus

1066MHz 1066MHz 1066MHz


1GB (one 1GB SO-DIMM) of 1066MHz DDR3 SDRAM; supports up to 8GB 1GB (one 1GB SO-DIMM) of 1066MHz DDR3 SDRAM; supports up to 8GB 2GB (two 1GB SO-DIMM) of 1066MHz DDR3 SDRAM; supports up to 8GB

Hard drive

160GB Serial ATA5; 7200 rpm

Optical drive

Slot-loading 8x SuperDrive with 4x double-layer burning (DVD±R DL/DVD±RW/CD-RW)


20-inch (viewable) glossy widescreen TFT active-matrix LCD, 1680 by 1050 pixels, millions of colors


Built-in iSight camera; Mini DisplayPort output with support for DVI, dual-link DVI, and VGA video connections via adapter4


NVIDIA GeForce 9400M with 256MB of DDR3 SDRAM shared with main memory3


One FireWire 800 port; 7 watts


Four USB 2.0 ports on computer; two USB 2.0 ports on keyboard


Built-in stereo speakers with 24-watt digital amplifier, built-in microphone, optical digital audio output/headphone out, optical digital audio input/audio line in


Mac OS X v10.5 Leopard Mac OS X v10.6 Snow Leopard
  • Mac OS X includes iTunes, Time Machine, Quick Look, Spaces, Spotlight, Dashboard, Mail, iChat, Safari, Address Book, QuickTime, iCal, DVD Player, Photo Booth, Front Row, Xcode Developer Tools)
iLife ’09 iLife ’11
  • iLife includes iPhoto, iMovie, iDVD, iWeb, GarageBand


Built-in 10/100/1000BASE-T (Gigabit)


Built-in AirPort Extreme Wi-Fi (802.11n)2

Hardware accessories

Apple Keyboard and Apple Mighty Mouse

Configure-to-order options

  • 2GB (two 1GB) or 4GB (two 2GB) Memory Upgrade
  • 4GB (two 2GB) Memory Upgrade
  • 320GB Hard Drive
  • Apple Keyboard with Numeric Keypad
  • Apple USB Modem

Limited warranty and service

Your iMac comes with 90 days of free telephone support and a one-year limited warranty. Purchase the AppleCare Protection Plan to extend your service and support to three years from your computer’s purchase date. Only the AppleCare Protection Plan provides you with direct telephone support from Apple technical experts and the assurance that repairs will be handled by Apple-authorized technicians using genuine Apple parts. For more information, visit Apple support or call 800-823-2775.

Apple and the global environment

Learn more about Apple’s dedication to reducing the environmental impact of our products and process. The Apple Product Environmental Specification details the environmental attributes of our products.


Apple takes a holistic view of materials management and waste minimization. Learn more about how to recycle your Mac.




  • Time Capsule
  • AirPort Express Base Station
  • AirPort Extreme Base Station
  • Apple 8x DVD-R Media Kit
  • Apple Mini DisplayPort to DVI Adapter
  • Apple Mini DisplayPort to VGA Adapter
  • Apple Mini DisplayPort to Dual-Link DVI Adapter
  • Apple FireWire Cable
  • AppleCare Protection Plan


  • iWork
  • Aperture
  • Logic Express

  1. Weight varies by configuration and manufacturing process.
  2. Wireless Internet access requires a wireless access point and Internet access; fees may apply.
  3. Memory available to Mac OS X may vary depending on graphics needs. Minimum graphics memory usage is 256MB.
  4. Adapters are sold separately.
  5. 1GB = 1 billion bytes and 1TB = 1 trillion bytes; actual formatted capacity less.
Published Date: Mar 8, 2017