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Supermicro X299 Overclocking Guide (Page 3)

By Steven Bassiri from May 24, 2018 @ 18:25 CDT

CPU Core Setup

You must first get into the "Advanced mode" to find overclocking settings.


There are three submenus under the Overclocking menu. We will tackle the CPU menu first, then voltage, and then memory.


You will need to set "All Core OC Setting" to the overclock frequency you are aiming for. Setting this to 4.5GHz instead of leaving it on manual seems to increase some behind the scenes locks on overclocking.


Now you can set some AVX offsets here (they are reduction ratios), so setting a ratio of two for both will take CPU frequency from 4.5GHz to 4.3GHz when the AVX units are engaged. AVX 2 and AVX 3 (also known as AVX-512) engage AVX units inside the CPU that can require higher levels of voltage and current, and many stability tests engage these units but not all applications use them. Games and most applications don't take advantage of AVX, but many professional and content production software applications might. One common application that uses AVX is Handbrake. Once you decide if you want to set an offset or not, then you need to click "Processor" at the bottom of the menu, and that will take you to an advanced menu.


Now we need to increase the current limit so that our CPU can utilize a higher power level that the overclock will require. That is called the "Current Limitation" and you need to set this to 2048, which is the maximum setting. I would recommend not touching the PL1 and PL2 limits, and watch these to make sure that setting any other setting does not lower these limits. There are three more menus at the bottom of the "Processor" sub-menu, these are Turbo Ratio Limit, Hardware PM State Control, and CPU C State Control. The latter two will allow us to control if the CPU frequency stays Fixed or moves Dynamically.


A fixed overclock would mean that we are trying to get the CPU to stay at its maximum Turbo ratio (45x in this case) all the time, even when the load is light. A dynamic frequency would mean the CPU frequency will modulate up and down depending on load, so it saves power. For fixed frequency, we will need a fixed voltage for the CPU, and for dynamic, we will need the voltage to go up and down, and we will tackle those in a bit. If you want the CPU frequency to be dynamic you will can leave C State untouched and HW P-States untouched. If you want a fixed frequency, then I recommend disabling "Enhanced Halt State (C1E)", and I also set "Package C State" to C0/C1 since those are the most awake states.


If you want to have a dynamic CPU frequency then don't touch "Hardware PM State Control" settings. If you want it to be more fixed, then set "Hardware P-States" to disable. That will allow Windows to control the state of the CPU, and if you set your Windows Power Plan to "High Performance", you should get a fixed maximum CPU frequency even at idle.

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