AMD FX 8320 showing lower frequency in windows

What I want:
AMD FX 8320 @ 4GHz / 4.2GHz Turbo.

I've increased the multiplier in BIOS to overclock my AMD FX 8320 to 4000mhz and a turbo of 4200mhz;
BIOS is showing that it's running @ 4GHz
Windows computer properties is showing that it's running @ 4.01GHz
but in CPU-Z it's showing 3712.xx @ x18.5

Anyone knows what's up with this? I thought it should be running at 4GHz and go 4.2GHz if needed.

CPU: AMD FX 8320
Motherboard: M5A97 (1605 latest bios)
Graphics: Gigabyte Nvidia 660ti
RAM: 8GB Corsair Vengeance VP (cant remember any other details about my ram)
Cool n Quiet: OFF
OS: Windows 7 64bit
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