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F2A88XN - DRAM frequency set to 1866mhz run fine but after restart BOOT failure

NOOB here

It allows me to change the frequency via "XGP mode" and I confirm via CPU-Z, appears to run fine.. but after every restart.. I get a boot failure message and defaults back to "optimal" 1333???

The volatage reads 1.5 but will not allow me to select and adjust

2 ADATA XPG V2 8G 1866mhz

A10 7850k

please help, let me know if you need any other info