Will 1333 MHz RAM work in a 27" 2012 Intel 3.2 iMac?

I've got a 27" 2012 Intel iMac 3.2 Ghz - got 4 Gig of Corsair DDR3 laptop RAM that appears to be compatible but it's 1333 MHz instead of 1600 MHz.  I'm assuming it would work but would drop the overall memory speed to 1333 MHz from 1600MHz.  Or should I put down the bong and get the compatible 1600 MHz RAM from OWC/Crucial?

It will likely work, but how reliably is a question mark. The memory bus would run slower and reduce performance.
Get the spec'd memory for the computer. You might as well spend the money now then have to spend even more later.
Use OWC or Crucial, if you wish. I usually go with DataMem. But it really doesn't make any difference.

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