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Supermicro Z390 9th Gen OC Guide

By: Steven Bassiri | Overclocking in CPUs, Chipsets & SoCs | Posted: Jan 25, 2019 4:00 pm

Voltage Settings

 

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Once you set the CPU multipliers, then you set the voltages. If you set Advanced CPU OC Setting to your desired frequency, the voltages boxed above will be increased. At 5.0GHz the System Agent is increased to 1.400V, the Core Voltage Mode is set to Override, the Core Voltage is set to 1.45V, and the CPU_IO Voltage is set to 1.25v.

 

These are all TOO high and will need to be lowered. System Agent is 1.050v at default, we recommend not going above 1.3v, and recommend 1.25v as 24/7 maximum. Core Voltage in Override mode is good for finding stability; you would only set Adaptive if you want the CPU voltage to drop with frequency (if you allow it to drop depending on Windows Power Plan, Balanced = drop, High Performance = Max frequency all the time). Core Extra Turbo Voltage is not "extra" voltage; it is your desired voltage.

 

We found that when using adaptive mode, we needed to set a slight negative offset around -30mv to gain the same level of voltage as if we used to override. If you want 1.275v, which we found was pretty much our ceiling for cooling, set 1275 (1.275v) under override mode, and 1275 with a -30mv offset for the adaptive mode. CPU_IO voltage can be set at around 1150 (1.15v) to achieve decent results without adding too much heat. Load Line Calibration reduces voltage drop due to increased load; level 1 is the most aggressive at reversing the drop, we recommend level 2 even though auto rules take it to level 4 when overclocking.

 

 

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We found a very interesting setting in the CPU VR Settings Menu under the CPU features menu under the CPU Overclocking menu. It allows you to choose the CPU type you use, so the VRM configures itself for optimal levels. We didn't mess with it, but the Intel® 9th Gen Core™ i9 would be the S series 95W 8+2 CPU.

 

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You can find AC/DC loadline for the Core, and these do affect LLC. The Advanced CPU Overclocking Setting option, when set, will change these values according to how the BIOS engineer saw fit. Default is 0 on both so that you can tinker, but be very careful.

 

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You also have the ability to change an Uncore Voltage Offset, but since the Ring and CPU get the same voltage we don't really mess with this. We just wanted to show that it was an included setting.

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