Apple iMac (20-inch, Early 2009) vs Apple iMac (20-inch, Mid 2009)

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iMac (20-inch, Early 2009) compared with iMac (20-inch, Mid 2009)

	AppleiMac (20-inch, Early 2009)	AppleiMac (20-inch, Mid 2009)
Overview
Released
Released	March 2009	April 2009
Performance
Processor
Processor	Intel Core 2 Duo E8135	Intel Core 2 Duo 2 GHz (iMac Mid 2009) or Intel Core 2 Duo 2.26 GHz (iMac Mid 2009)
CPU cores
CPU cores	2	2
Graphics
Graphics	NVIDIA GeForce 9400M (256 MB shared DDR3)	NVIDIA GeForce 9400M (256 MB shared DDR3)
Memory
Memory	2 GB, 4 GB or 8 GB (better)	1 GB, 2 GB or 4 GB
Storage
Storage	320 GB to 1 TB (better)	160 GB to 320 GB
CPU
CPU	2.66 GHz Intel Core 2 Duo E8135 with 6 MB shared L2 cache and 1066 MHz frontside bus; exact chip identity cross-checked with EveryMac	2.0 or 2.26 GHz Core 2 Duo with 3 MB shared L2 cache and 1066 MHz frontside bus. The retained configuration table says 2.6 GHz, but its processor description and Apple's July 2011 education price list confirm 2.26 GHz; exact Intel SKU not established.
GPU
GPU	NVIDIA GeForce 9400M with at least 256 MB DDR3 shared with system memory; available system memory varies with graphics requirements	NVIDIA GeForce 9400M with 256 MB shared DDR3 according to the retained maker specification; contemporary EveryMac coverage describes 128 MB at launch, so the retained maker value is used.
Memory type
Memory type	Two user-accessible SO-DIMM slots for 1066 MHz DDR3; 2 GB standard, factory upgrades to 4 or 8 GB	Two SO-DIMM slots for 1066 MHz DDR3; configurations A/B have 1 GB standard and C has 2 GB. Factory options are 2 or 4 GB; the retained specification supports up to 8 GB, which is not listed as a factory configuration.
Storage type
Storage type	320 GB 7200 rpm Serial ATA hard drive, configurable to 640 GB or 1 TB; slot-loading 8x SuperDrive with 4x double-layer DVD burning	160 or 320 GB 7200 rpm Serial ATA hard drive; slot-loading 8x SuperDrive with 4x double-layer DVD burning.
Display
Screen size
Screen size	20″	20″
Resolution
Resolution	1680 × 1050	1680 × 1050
Brightness
Brightness	290 nits	290 nits
Display type
Display type	Glossy widescreen TFT active-matrix LCD, millions of colours; maker typical brightness 290 cd/m², contrast 800:1 and 160° horizontal/vertical viewing angle. Panel technology and refresh rate unpublished and omitted.	Glossy TFT active-matrix LCD with millions of colours; typical contrast 800:1 and 160-degree horizontal and vertical viewing angles. Panel technology and refresh rate unpublished.
Connections
Ports
Ports	DisplayPort, 4 × USB-A, Ethernet, headphone jack	4 × USB-A, Ethernet, headphone jack
Ethernet
Ethernet	1 Gb/s	1 Gb/s
External displays
External displays	Up to 1	Up to 1
Wi-Fi
Wi-Fi	802.11n draft	802.11n draft
Bluetooth
Bluetooth	2.1 + EDR	–
Camera
Camera	iSight camera	iSight camera
Back ports
Back ports	Four USB 2.0 ports on the computer, plus two on the supplied wired keyboard; one FireWire 800 port at 7 W, Mini DisplayPort output, Gigabit Ethernet, headphone/optical digital output and line-in/optical digital input. FireWire and audio input described here; no SD slot.	Four USB 2.0 ports on the computer, plus two on the keyboard; FireWire 800 at 7 W, Mini DisplayPort, Gigabit Ethernet, headphone/optical digital output and line-in/optical digital input. Bluetooth is not published in this exact model specification.
External displays
External displays	Full built-in resolution and one external display up to 2560 × 1600 simultaneously; extended desktop and mirroring, optional DVI/VGA/dual-link DVI adapters	Built-in display and one external display up to 2560 × 1600 simultaneously; extended desktop or mirroring, with optional DVI, VGA or dual-link DVI adapters.
Speakers
Speakers	Built-in stereo speakers with internal 24 W digital amplifier, microphone and support for Apple Stereo Headset microphones	Built-in stereo speakers and microphone; internal 24 W digital amplifier and support for Apple Stereo Headset microphones.
Keyboard and mouse
Keyboard and mouse	Apple Keyboard and Mighty Mouse; numeric-keypad keyboard, wireless keyboard or wireless Mighty Mouse available as options	Apple Keyboard and Mighty Mouse.
Design and power
Type
Type	All-in-one	All-in-one
Weight
Weight	9.1 kg	9.1 kg
Width × depth × height
Width × depth × height	485 × 189 × 469 mm	485 × 189 × 469 mm
Operating system
Operating system	macOS	macOS
Size and weight detail
Size and weight detail	–	Maker reference weight; actual weight varies with configuration and manufacturing process.
Power supply
Power supply	Maximum continuous power 200 W; 100–240 V AC, 50–60 Hz single phase	Maximum continuous power 200 W; 100–240 V AC, 50–60 Hz.
Materials
Materials	Aluminium and glass enclosure with arsenic-free display glass, BFR-free components and PVC-free internal cables	–
In the box
In the box	iMac, Apple Keyboard, Mighty Mouse, cleaning cloth, power cord, install/restore DVDs and documentation; Mac OS X Leopard and iLife '09	Education institution model. Contemporary EveryMac coverage records April 2009 release; a maker-confirmed first delivery day is unavailable. Launch configuration A includes Leopard and iLife ’09; later B/C specifications list Snow Leopard and iLife ’11, with their introduction dates unestablished.