Check your CPU temp.
Switch your power plan to "High Performance" and reset it to default settings.
Uninstall any software that you are using for tweaking your system.
Reset your BIOS to default settings.
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Is the CPU sitting at 1.4Ghz when the cores are loaded up?
if so then it could be heat (VRMs, CPU, Socket) or the power saving stuff playing up (Cool & Quiet, C6 and APM).
If it isn't then it's just Cool & Quiet doing it's job
In addition to the above advice, does your mobo support the FX-8320 CPU? (Your mobo maker's website tells what CPU models each mobo model/ Rev. support and which BIOS must be used). If so have you installed the latest BIOS so your mobo can properly identify your CPU model?
Problem is, that no one want to post system information. And you should ask for it (maybe twice)
Or make guesses.
I can run a FX-9590 of a Crosshair IV Formula........it's not supported either.....
EVERY 970,990X and 990FX board supports the FX line of CPUs
Unless they are running it in a cheap and nasty AM3 (not +) board then I can't see that being an issue