Upgrading RAM for an iMAC  Intel Core i5 2.8 GHz Quad Core - Late 2012 (I'm guessing).

I have an iMAC Intel Core i5 2.8 GHz Quad Core - Late 2012 (I'm guessing).  I am trying to upgrade the RAM of my iMAC and I am not sure how to go about it. Running on OSx 10.6.3
This iMac has 4 slots - Currently my RAM is using 2 slots with 4 GB so I have 8 GB right now. 
The speed is 1333MHz. Now I have some RAM that could get to 32GB but the 4 RAM chips speed is
1866 MHz.
Would it be possible to swap my old RAM (8GB) 1333MHz for the new 1866mhz RAM? even with the difference in speed?  The RAM is from Crucial. 
If possible I can try and swap the RAM if I get inside my iMAC.

If you are really running 10.6.3, then you do not have a 2012 machine. Please check to see if this is yours (it's a 2010):
http://www.everymac.com/systems/apple/imac/specs/imac-core-i5-2.8-27-inch-alumin um-mid-2010-specs.html
It also mentions the exact specs of the RAM. I would only use the RAM supported by Apple; using the higher speed rated RAM will not result in higher speed.

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