So basically your asking for a guide on how to over clock the cpu.
First of all how much you can over clock the cpu will relate to how good your motherboard is.
If the motherboard was cheap and around the £60 or $60 mark then you will in all likely hood be limited to how much you can over clock your FX 8320 cpu based on the chip set the motherboard uses.
For example a Asus M5A99X Evo motherboard give a good over clocking end result.
A board with an AMD 970 or a AMD 990FX chip set on the motherboard will give you some over clock of the FX cpu.
The 990FX gives a slightly better over clocking result than the 970.
The second key component is how good your Cpu cooler is, with the stock AMD cpu cooler provided with the AMD FX 8320 cpu you will see a very poor over clock, and the cpu temperatures will be high when attempting over clocking.
The third key component to a good over clock is how well you can change voltages relating to the cpu core voltage.
And the fourth is a well branded PSU with good wattage output 650W
Ok so the FX 8320 at base stock clock speed runs at 3.5Ghz, the Amd auto over clocking or core boost will take the cpu to 4Ghz speeds when the cpu is put under heavy work loads.
The cpu multiplier is linked to the FSB speed. 200Mhz by default for all FX based cpu`s.
How the speed is worked out is the FSB speed times the multiplier value of the cpu set.
So for stock speed of the FX 8320 cpu it is 200 X 17.5 = 3500Mhz, or 3.5Ghz.
So 200 X 20 = 4000Mhz or 4.0Ghz.
At that point you should notice that the core voltage of the cpu has increased.
The faster you ask a Cpu to work the more voltage it requires to keep it stable.
And why when you set the cpu multiplier to 200 x 22 = 4400Mhz , or 4.4Ghz.
It is why the cpu fell over when trying to stress test with cpuz.
What you needed to do was increase the core voltage of the cpu at the setting of 200 X 22 in the bios.
The cpu core voltage should of been set to about 1.39 to 1.4v
Then test the cpu for stability by running a cpuz stress test cratftierspace, while keeping an eye when running what the cpu is reaching in tempreture.
You should try to keep the cpu in about the 60c to 64c temperatures.
When stress testing.
If it passes and the cpu is stable and does not crash and the temps seem fine.
You then go back into the bios and up the cpu multiplier by half a value. example 200Mhz X 22.5 =4500Mhz, 4.5Ghz. @ 1.4v or 1.45v
Then test again.
From that point on the core voltage of the cpu should be raised in small steps about 0.250Mv to 0.500Mv steps.
Here is the warning, you must have a good cpu air cooler, or at least a water loop on your cpu.
Never take the core voltage of the FX cpu above 1.55v.
On average a FX based cpu will over clock by at least 800Mhz above it`s default cpu frequency of 3.5hz for a FX 8320 cpu.
With a good water cooling setup on the cpu, or a very big air cpu cooler fitted, and a good quality motherboard you can expect up to 1Ghz over the stock speed or frequency of the FX 8320 cpu.
When you hit 1.45v the Cpu temperatures will rise very rapidly.
So you must keep a close eye on the Cpu temps. cratftierspace ok.
The higher the cpu frequency set the more voltage increase on the cpu core is needed, when the cpu is put under stress testing like cpu Z.