Navigating Supermicro's Z390 UEFI
You enter the BIOS/UEFI by hitting the "delete" button when you see the postcode "b2"(or "62"), or when your keyboard's "number lock" light turns on. Once in the BIOS, hit "F7" to switch to Advanced Mode. Once in the advanced mode, go to Advanced Settings and change your default boot page to "Advanced Mode," it's a setting at the top of the page above the submenus. If you need to revert to Optimized Defaults, you can press F5, and F10 can be used to save and exit. With this version of the UEFI, you can navigate with only a keyboard, which we find easier.
There are four sub-menus under the Overclocking tab. The CPU Overclocking menu has multiple sub-menus, but you don't need to enter more than three of them. The Memory Overclocking sub-menu is one page and is very easy to understand. The Graphics Overclocking menu is for iGPU overclocking, not discrete GPU overclocking, so we don't cover it here. The Voltage Configuration menu is where you handle all voltage stuff.
With Supermicro motherboards we highly recommend users load Supermicro's pre-programmed frequency levels, they go up to 5.5GHz. However, we HIGHLY recommend you do not just save and exit, you will need to lower the auto-rule (automatic changes to make all CPUs capable of the OC setting) voltages the profile sets. The main reason we recommend setting the setting boxed in red to 5.0GHz for 5GHz or 5.2GHz for 5.2GHz is because it configures the backend correctly. We recommend you set FCLK to 1GHz, it is boxed in blue. Boxed in orange is our AVX offset, which is the number of multipliers that are lowered for CPU frequency when AVX units are engaged.
Programs like HandBrake use AVX units, which require more voltage and power to remain stable, especially when compared to games that don't use AVX. If your games are stable at 5.2GHz and your HandBrake is stable at 5.0GHz, you can set a "2" offset, so the CPU will run 5.2GHz with games and 5.0GHz with HandBrake. We prefer not using this, but if you do, you need to stress the CPU with both AVX and older non-AVX Prime95 versions for total stability. The Tjmax offset was added for the Intel® 9th Gen Core™ i9, and it allows you to increase the throttle point from something like 100C to 115C. It can be dangerous, but Intel added it in, so we feel it might have some value.
We wouldn't recommend increasing it over 110C. The power limits boxed in yellow will increase automatically when you set Advanced CPU OC Settings to the frequency you want, but you can manually increase these up (we didn't find it changes anything major to do so). The sub-menu boxed in pink is discussed below.
In the CPU Feature menu, we find Intel SpeedStep (known as EIST), don't disable this. The C states will automatically be disabled if you set Advanced CPU OC Setting to your desired frequency (see the trend?). You don't need to tinker in the menu boxed in green, but the one boxed in blue is where you can increase the frequency of the cache/ring bus up from the 4.3Ghz default.
The Ring menu is pretty straight forward; we find that just setting 4.7GHz (by setting 47x) is pretty straightforward and doesn't impede stability. We recommend not messing with Ring Down Bin.
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