Hi , can this work with the iMac (21.5-inch, Mid 2011). currently I have the1333MHz installed and I want to upgrade, is it ok to use the 1866MHz ?

iMac (21.5-inch, Mid 2011)

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    Hi Abdu! Go up on the left corner where the apple logo is at. Click about this Mac, here you will see the OS X and info, click on Memory and it will tell you what your mac can use, like 1333 MHz DDR3. This is the only RAM that will work for the 21.5in iMac, Mid 2011, that is what mine is.

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