Looking for best RAM for my 21inch iMac

Can I use a faster memory card than a 4gb 1333mhz ddr3 sdram? If so what is the best to use. I will in the future be doing video editing and i also use big files in Photoshop. I have a
iMac 21.5-inch, Mid 2011
Memory  4 GB 1333 MHz DDR3
Processor  2.7 GHz Intel Core i5
Graphics  AMD Radeon HD 6770M 512 MB
OS X 10.8.2 (12C54)
Thank you

If you are in the UK call Crucial.com.   There you can one to one on the phone and discuss your needs with an expert.   In North America, call OWC for the same service.
Crucial.com Memory EU France - Memory for Dell, Mac, Apple, HP, Compaq, SSD
Performance Upgrades; FireWire USB SATA Storage; Memory, more at OWC

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