Step 4: Adjust Voltages CPU voltage settings displayed below:
CPU Vcore: For extreme cooling( LN2) you’ re aiming for 1.85-1.90V to max out your CPU. There are CPUs that can obtain higher frequencies using higher voltages but 1.85V is a good starting point.
CPU VCCIO and CPU System Agent: These settings will mainly aid you in memory overclocking. A setting of up to 1.4V on both maxes out most DRAM. We suggest you start slowly from 1.3V on both and find the optimum value for your DRAM / CPU.
VCC Substained: Set this to 1.45-1.55V. Start from 1.45V and check if your CPU needs more. If you’ re getting random freezes at high clocks raise it to a higher value.
VCCPLL: Make sure you have iGPU disabled before you do this as it might kill your iGPU otherwise. Make sure you are using a discrete graphics cards. 1.8V should eliminate CB in a CPU. From our experience you don’ t need higher than that. If you’ re limited only to 1.5V then you need an X version bios( available in“ Overclocking Software” section).
VCCPLL OC: You’ re looking at values around 2.0V. It helps if you’ re hitting the CB earlier than you should(-130C or so). Some CPUs need higher but 2.0V is a good starting value. Keep this value under 3.0V or you might degrade your CPU.
VCCVTT: 1.65V should work well for most of the CPUs. If you’ re getting random freezes at high clocks try to raise it. Keep this under 1.75V or damage could be done to your CPU even when using LN2.
VCCDMI _ PEG: This setting is used to stabilize your 3D VGA performance. We always set it at 1.4V and then raise it when it’ s needed. Depending on how your VGA behaves, up to 1.85V is fine. Make sure you raise VCCIO along with VCCDMI _ PEG, set VCCIO anywhere from 1.25V to 1.4V otherwise your CPU might not boot.
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