Navigating GIGABYTE'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 "F2" to switch from Easy Mode to Advanced Mode. Once in the advanced mode, go to the "MIT" menu by hitting the right arrow key once. It's easier to navigate the UEFI through the keyboard, and to enter in a multiplier you can type it in, same as voltages. The UEFI does offer mouse control, but some mice might not move the cursor quickly. GIGABYTE has a "Mouse Sensitivity" option under the "BIOS" menu. Try a setting of x4.
You will notice three menus in the MIT menu; one for CPU, one for memory, and one for voltages. You probably won't need to enter the memory menu since setting XMP can be done through the Frequency menu. You might notice that there is a Smart Fan 5 settings menu in the MIT menu; that is where you control the fans. You can move in and out of menus by pressing "enter" and "esc," and you load optimized default by pressing "F7" and save and exit the BIOS by pressing "F10". You can also save and load BIOS profiles (settings) in the save and exit menu.
You can change the BCLK by typing in a value for CPU Base Clock, but we don't recommend changing it from default 100MHz. CPU Upgrade options are available, and these are presets GIGABYTE's engineers have devised, but we find that they overcompensate in voltage because they need to support all CPUs at those frequencies. If you want all cores to 5GHz, then you can enable Enhanced Multi-Core Performance, which takes all cores to maximum single-core Turbo (5Ghz on 9900K), but we don't recommend it since it will take your voltage too high in most cases.
Instead, you will type your CPU ratio into CPU Clock Ratio, we typed 50 for 5GHz. FCLK is at 1GHz by default, just leave it there. We can also enable XMP for our memory here, we always do, and that way you don't need to enter the DRAM menu or DRAM voltage menu. After you set your clock and enable XMP, you should hit the "enter" key on the Advanced CPU Core Settings.
The first thing we need to decide when overclocking is if we want to use an AVX offset, by default it's 0. If we set 2, then our CPU core frequency we set earlier will go from 50 to 48 (4.8GHz) when a program uses AVX units in the CPU. Most stability tests use AVX, as do programs like HandBrake and Blender. We opted not to use an offset. Default cache/uncore frequency is 4.7GHz on this motherboard, we will leave it be so we don't need to pump extra volts into the VCore, you can lower this or make it go higher, but there is not much need.
Then we want to jump down to Core Current Limit, and set this to 255 just to be safe. Don't bother with the wattage settings here, they are unlocked when you overclock. Now, you can disable all the Intel features like Speed Shift and Race to Halt, but we find it doesn't make much difference. At this point in time, you will want to disable the settings boxed in yellow, as these will take your CPU ratio down when idle and can cause instability.
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