The default "Core Voltage Mode" is Adaptive, and we can use this if we have a dynamic frequency, but if we have it fixed it is better to set this to Override. With Override we will set 1.185v, and that will result in roughly 1.185v internally. With Adaptive we set a ceiling voltage in the "Core Extra Turbo Voltage" setting, here it is set to 1200, which is 1.2v. However, the setting we set is the maximum voltage and it will allow voltage to scale with frequency.
Now, Adaptive voltage we set might not what we get, in fact here we got 1.240v in Windows, so we proceed to set a negative ("-") "Offset Prefix" and a "Core Voltage Offset" to 40, which will result in 1.2v under load. With the voltage going up and down such a large range, it could overwork the VRM resulting in voltage spikes when the voltage is ramped up, as the feedback loop of the VRM might be too slow. A solid VRM will help you avoid shooting more voltage than you want into your CPU, so on a motherboard like this you should be just fine with Adaptive voltage mode since it will provide a good input voltage. Now, we also need to change our Mesh frequency, Uncore voltage, and SVID/FIVR.
If you click on the CLR/Ring menu you will be taken to the "CLR Max OC Ratio", which is your top "Mesh" frequency. The Mesh interconnects the CPU cores, and it might be called cache or ring speed in other places. We recommend a range between 28 and 32, we set 30 for 3GHz. The voltage mode for this setting is much like the CPU VCore voltage, and we set around 1.2-1.25v for this setting.
Now motherboard BIOS engineers typically set up "Auto-Rules", and in this case they have for the Uncore Voltage Offset (mv), so we will lower this from 512 to 256. The offset here is internally derived from the internal VRM (FIVR), as are the CPU Core and CPU Mesh voltages.
However, as we raise frequency and internal voltages we also need to increase our external VRM settings or else performance will take a hit. We will set "SVID Voltage Override (mv)" to 2100 for 2.1v. The default input voltage is 1.8v, but 2.1v is what we need to set to unlock performance. We leave "Load Line Calibration" on "Auto", but there are seven levels you can try out. We saw that when we set 2.1v with LLC auto we get anywhere between 2.1-2.08v, which works great for us. The "SVID VCCSA Voltage (mv)" and "SVID VCCIO Voltage (mv)" are set a bit high when you set XMP, 1.3v on both is a bit high. We will lower this to 1.25v for the VCCSA and 1.15v for the VCCIO.
Here we set XMP for our memory, but you don't necessarily need to utilize XMP to overclock memory. You can also select a "Manual" option that allows you to overclock memory through the multiplier and memory timings. A neat little feature that Supermicro motherboards offer is the ability to easily tweak XMP timings by setting XMP and then changing to manual mode, where it retains the XMP timings. That way you can take down timings one by one.
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- Page 1 [Introduction to Overclocking and the Basics]
- Page 2 [Disclaimer and Before You Begin Overclocking]
- Page 3 [CPU Core Setup]
- Page 4 [Voltages, Mesh, and DRAM Overclocking]
- Page 5 [SuperO Booster, Results, and VRM Thermal Testing]
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