It will work fine.
Your memory has different "profiles" and will use one of the lower ones automatically, or you can adjust everything manually.
*Your manual states that with an "FX" CPU you should get up to 1866MHz without overclocking. It might not default to that (may default to lowest, 1333MHz). There should be something similar to Intel's "XMP" which assigns the optimal memory profile for your setup.
You should have different options, and it depends if you overclock the CPU or not, however I would first do THIS:
1) insert memory (see motherboard manual for correct slots if not using all slots)
2) use default CPU/memory settings
3) run Memtest86 www.memtest86.com
Create that on USB or DVD, then run for a full pass at default settings (about 30min or so for 8GB).
Then you can look into optimizing the settings for the CPU and memory if need be. If you don't overclock the CPU, and the memory is 1333MHz then look for the setting that optimizes the memory profile (then should go to 1866MHz).
REPEAT Memtest86 for a full pass when you change the memory settings.
If problems setting up, give a shout
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