To manually overclock a Fx based cpu there are a few things you have to do, and also change in your bios.
Under the advanced bios settings option if your motherboard has the option.
Any auto overclocking should be disabled in the bios.
Amd cool and quiet should also be disabled.
You must set the multiplier value for the cpu manually.
And keep the base clock at the 200 Mhz setting in the bios also
The factory default speed of a FX 8350 cpu is 4.0 Ghz.
When overclocking the formula for working out what the end clock speed of the cpu will be set to it.
The base 200 Mhz speed times the clock multiplier set of the Fx cpu in your bios settings.
Example : 200 x 20 = 4000 Mhz or 4 Ghz speed.
So 200 x 23 = 4600 Mhz or 4.6 Ghz.
The average overclock from a Fx 8350 cpu set at stock speed will be around 800 Mhz giving 4.8 Ghz of overall speed.
But in order to reach that speed, as you increase the multiplier value of the cpu set in your bios.
You also have to add more voltage to the cpu core.
Because the faster you push a cpu in frequency over it`s stock setting of 4.0 Ghz the more power it requires to keep a stable over clock and remain running at that speed where is does not crash or the board does not power the cpu enough to keep the cpu stable due to the extra speed it is asked to do.
As an example if you set the cpu multiplier value to 200 x 24 the clock speed of the cpu as a end result would be 4.8 Ghz in speed.
But you would also have to increase the core voltage of the cpu to around 1.45v MrWilliyP.
Once you have set the values, you always have to save the new changes in the bios via the save settings option to apply them.
If you don`t, then exit the bios on the next restart of the system it will revert back to the 4.0 Ghz speed.
So you must ensure you save the new changes all of the time before you exit the bios.
If the system fails to boot or power up properly it is due to the speed you have set for the cpu to run at, and the fact that you have not increased the core voltage of the cpu that is also required at the same time.
The maximum voltage limit for a FX based cpu is 1.6v on the cpu core.
You should try to keep the value for the voltage at around 1.5v to 1.55v
As 1.6v can damage the FX cpu due to the voltage setting being to high.
As you increase the clock speed of the cpu, and the core voltage also of the cpu to keep it stable running at the set frequency.
The negative effect is that the heat the cpu generates greatly increases and rises in tempreture.
If you are attempting to overclock a FX based cpu it is important that you use or buy a very large good quality cpu air cooler for the cpu, or a Aio water cooling loop on the cpu to keep it cool.
Never try to overclock the cpu if you are using the cpu air cooler that came with the AMD fx cpu in the box provided.
It is not up to the job of keeping the cpu cool enough, at a fast enough rate.
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