What kind of Ram do I need for my Mac?

Hello
I want to upgrade the speed of my mac by adding a 2GB stick of ram. But what kind of ram do i need? Would this work for my Mac (Mid 2011 21.5 inch) http://www.amazon.co.uk/Crucial-PC3-10600-Desktop-Upgrade-240-pin/dp/B001NA25VS/ ref=sr_1_1?ie=UTF8&qid=1390290563&sr=8-1&keywords=2gb+ram?

Macs are very, VERY picky about the RAM specs they need.
That RAM is the wrong pin count and probably for PCs and not a Mac
Here is the proper RAM spec for your year and model.
32 GB (Actual) 16 GB (Apple)
Memory Slots
4 - 204-pin PC3-10600 (1333 MHz) DDR3 SO-DIMM
Correct and reliable Mac RAM can be purchased from online Mac RAM sources Crucial memory or OWC (macsales.com).
http://www.crucial.com/store/listparts.aspx?model=iMac%20(21.5-inch%2C%20Late%20 2011)&Cat=RAM
http://eshop.macsales.com/shop/memory/iMac/2011/DDR3_21.5_27
Good Luck!

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