AMD FX processors natively support up 1866MHz RAM, but I've seen 2400MHz run successfully on this board...
In your manual there is a list of supported RAM for the CVF-Z on page 1-11...
I have the Corsair Vengeance Pro CMY16GX3M2A1866C9R set of RAM, this is recommended in the manual
I have no problems with them, although I've read on Overclock.net that p[eople have been having issues with Corsair memory...
I've always used corsair without issue...
Good Luck,
Mike