Question ram compatibility

Oct 4, 2018
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I have this motherboard: asus M4A78LTM, and i want to know if my ram is compatible with my mb. I want to buy x2 4gb 1600 mhz, I found them very cheap but I don't know if they is compatible.
on the manufacturer's website says something "o.c. but I don't know what it is.
please help me, thx