Use the BIOS to adjust these and the memory should be able to go beyond 2966MHz. Even at 2966MHz, the rest of the timings remained at 15-17-17-35 2T. So dropping it down to 2966MHz, the system once again became stable enough to complete the benchmark suite. At 3000MHz, we would get random freezes again. Starting at 2900MHz, we ran through all the benchmarks until we were unsuccessful. Once we were able to get the CPU overclock stable, we turned our focus to the memory. ASUS Sabertooth Z170 S CPUz Memory Overclock Reducing the multiplier to 49, 4.9GHz, we were able to successfully run all the benchmarks without any issues. During various benchmarks the system would freeze going to 5.1GHz we couldn’t boot into Windows without a BSOD. Using our normal process, we were able to get the ASUS Sabertooth Z170 S to boot at 5.0GHz, however it was a little unstable. ASUS Sabertooth Z170 S CPUz CPU Overclocked If the system is unstable, we will lower the CPU Ratio by one until it is stable. If we are able to successfully boot into Windows, we will run a few tests to verify stability. At which time, the CPU Voltage will be increased to a maximum of 1.45V. Starting with a low overclock of 4.4GHz (Ratio set to 44), we will increase the Ratio by one until we are no longer able to get the system to successfully post. We will use this option to overclock the memory. The common DDR4 memory speed options are built in, with a maximum speed of 4266MHz. Switching over to manual settings, we can quickly overclock the memory using a drop down menu. Using the XMP setting, the memory was correctly set to 2666MHz with 15-17-17-35 2T. As the default ratio is 40, we will start with that. What we will change is the Core ratio, switching it from Auto we can type in a number for the ratio we want. You can set this to allow each core to have different maximum ratios, however for our testing we will leave it at the default. The CPU Core Ratio is pre-configured to “Sync All Cores”, this makes all the CPU cores have the same ratio.

If you are interested in overclocking the CPU and Memory, you will want to turn your attention to the AI Tweaker menu. ASUS Sabertooth Z170 S AI Tweaker and CPU Overclocking Switching over the Advanced Mode you can get into much more detail settings. The default BIOS screen is the EZ Mode, here you can select and configure basic options on the Sabertooth Z170 S such as Boot Priority, XMP profile selection, FAN control, and pre-configured system profile. Like most modern UEFI BIOS, the Sabertooth Z170 S has two different modes, depending on user experience and needs. ASUS Sabertooth Z170 S BIOS Advanced Mode

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