That motherboard was only able to run the FX-9xxx processors after a BIOS update.
What motherboard BIOS are you using?
Is that the only processor you have used on that motherboard?
If not, did you clear the CMOS when you installed the FX-9xxx processor.
Also, what CPU cooler are you using? Has there been any issues with overheating?
Check for the correct BIOS version, clear the CMOS and set all motherboard settings to default.
I have done this and it is still having flucuations