What is the difference between these machines??

I am confused about the i3, i5, & i7, what does that mean?
Refurbished iMac 27-inch 3.33GHz Intel Core 2 Duo
Originally released late 2009
27-inch LED-backlit glossy widescreen display
4GB memory
1TB hard drive
8x SuperDrive (DVD±R DL/DVD±RW/CD-RW)
ATI Radeon HD 4670 graphics with 256MB memory
Built-in iSight camera
Refurbished iMac 27-inch 3.2GHz Intel Core i3 processor
Originally released July 2010
27-inch LED-backlit glossy widescreen display
4GB memory
1TB hard drive
8x SuperDrive (DVD±R DL/DVD±RW/CD-RW)
ATI Radeon HD 5670 graphics with 512MB memory
Built-in iSight camera
Refurbished iMac 27-inch 2.66GHz Quad-Core Intel Core i5
Originally released late 2009
27-inch LED-backlit glossy widescreen display
4GB memory
1TB hard drive
8x SuperDrive (DVD±R DL/DVD±RW/CD-RW)
ATI Radeon HD 4850 graphics with 512MB memory
Built-in iSight camera
Refurbished iMac 27-inch 2.8GHz Intel Quad-Core i5 processor
Originally released July 2010
27-inch LED-backlit glossy widescreen display
4GB memory
1TB hard drive
8x SuperDrive (DVD±R DL/DVD±RW/CD-RW)
ATI Radeon HD 5750 graphics with 1GB memory
Built-in iSight camera
Refurbished iMac 27-inch 2.8GHz Quad-Core Intel Core i7
Originally released late 2009
27-inch LED-backlit glossy widescreen display
4GB memory
1TB hard drive
8x SuperDrive (DVD±R DL/DVD±RW/CD-RW)
ATI Radeon HD 4850 graphics with 512MB memory
Built-in iSight camera
Refurbished iMac 27-inch 2.93GHz Intel Quad-Core i7 processor
Originally released July 2010
27-inch LED-backlit glossy widescreen display
4GB memory
1TB hard drive
8x SuperDrive (DVD±R DL/DVD±RW/CD-RW)
ATI Radeon HD 5750 graphics with 1GB memory
Built-in iSight camera

Welcome to Discussions, suzy at home
suzy at home wrote:
I am confused about the i3, i5, & i7, what does that mean?...
These are three identifiers of different processors. See the upper right quadrant of this page for speeds and cache RAM difference:
http://www.apple.com/imac/specs.html
Higher "i" numbers will generally be faster in use.
If you want to talk more about pre-purchase questions, call 1-800-MY-APPLE (800-692-7753).
EZ Jim
Message was edited by: EZ Jim
Mac Pro Quad Core (Early 2009) 2.93Ghz Mac OS X (10.6.6); MacBook Pro (13 inch, Mid 2009) 2.26GHz (10.6.6)
LED Cinema Display; G4 PowerBook 1.67GHz (10.4.11); iBookSE 366MHz (10.3.9); External iSight; iPod4touch4.2.1

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