Is it safe to upgrade my 21" iMac from 4GB to 12GB of RAM

I want to upgrade my iMac 21" from 4GB of RAM to 12GB and was just wondering if this was safe/ ok?

CoolZack20 wrote:
I want to upgrade my iMac 21" from 4GB of RAM to 12GB and was just wondering if this was safe/ ok?
According to this, 
http://www.everymac.com/systems/apple/imac/specs/imac-core-2-duo-3.06-21-inch-al uminum-late-2009-specs.html
which is the oldest 21.5 inch iMac I could find, this model came with 4 GB standard RAM and can be upgraded to 16 GB.
Whether you will notice a difference depends on what you use the computer for. If you use programs like Adobe Photoshop, MS-Office, or have many photos and lots of music in iphoto and itunes, you would see a noticeable improvement. Also, if you keep a lot of software running at once, there will be a very big improvement in speed and responsiveness.

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