It depends on your level of interest in learning more about overclocking and your patience with stress testing and tuning your PC for it's ultimate performance.
The first thing you need to understand that when you OC your CPU your warranty is void if you some how damage it. While AMD CPUs are robust running them beyond their rated frequency still has a failure risk. If that's super important then you should probably not OC.
If however you decide to OC then you must decide if you want the maximum performance or just excellent performance with all of the power savings features enabled. The reason for this is many CPUs can run at a higher OC when the power saving features are disabled. This however results in a little more power consumption and heat, though not usally a lot.
If you're sticking to all the power saver features then you've probably reached most of the potential for your CPU @ 4.2 Ghz. You could manually up the vcore a bit and try for 4.3 GHz. with Prime 95 100% stability.
If you want to go full manual and see what is possible, I'd suggest disabling C1E, C6, C&Q, Turbo mode, Application Power Management or similar in your BIOS. Make sure the CPU fan setting is at 100%. Always monitor your CPU temp and do not allow it to exceed 61C core temp per AMD. (CPU temp is NOT core temp. You want the internal core temp at or below 61C).
The following settings help a lot of people achieve good overclocks of the FX-8320 and FX-8350. They are NOT however guaranteed as all mobos, CPU and RAM vary. Hopefully they will allow you to work your way up to a stable ~4.4 GHz. frequency with 100% P95 stability.
FYI - It can take weeks to months to test all of the possible BIOS settings that will optimize your PC performance. Changing one setting at a time and then stress testing is mandatory. It's a LONG process if you want to find all of the available performance.
vcore will likely be in the ~1.45v range - if your cooler can keep temps below 61C in stress testing. You can often get 85-90% stability at the default vcore but if 100% stability is important you will often need a considerably higher vcore and that means more heat so watch your core temp
HT= 2600 MHz.
HT voltage = 1.25v
CPU-NB = ~1.3v
RAM voltage increased ~.05v from default specified voltage
Maunally set the RAM timings and voltages. "Auto" does not always work well.
Test Load Line Conditioning (LLC), if your mobo has it, to find the best setting to hold the vcore steady when you stress test, at whatever you manually set the vcore to.
Building a reliable PC involves more than just assembling the parts. You need to be able to configure all of the BIOS settings appropriately. This can be quite involved and frustrating as it can require a lot of trial and error with stress testing. It is however often the only means to get a 100% reliable PC.
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