We’re overclocking the Intel UHD Graphics 770 integrated into the Core i9-13900K Raptor Lake CPU up to 2500 MHz in 5 minutes or less using the ASUS ROG Maximus Z790 Hero motherboard and EK-Quantum custom loop water cooling.

I’ll speedrun you through the BIOS settings and provide some notes and tips along the way. Please note that this is for entertainment purposes only and most certainly not the whole picture. Please don’t outright copy these settings and apply them to your system. If you want to learn how to overclock this system, please check out the longer SkatterBencher article.

All right, let’s do this.

5 Minute Speedrun

When you’ve entered the BIOS, go to the Extreme Tweaker menu

Set Ai Overclock Tuner to XMP I. That will load the base information of the XMP profile, including the primary timings, frequency, and voltage, and let our DDR5 memory run at its high-performance specification. The ASUS motherboard will optimize the secondary timings.

Set BCLK frequency to 125 MHz. The base clock frequency is the reference clock for many parts inside your CPU, including the P-cores, E-cores, integrated graphics, ring, system agent, memory controller, and system memory. In most overclocking scenarios, you never have to increase the base clock frequency as plenty of multiplier ratios are available to push your cores or memory to the max. However, the Raptor Lake UHD Graphics 770 integrated graphics overclocks so incredibly high that the available ratios up to 42X are simply insufficient. So, the only way to get the most out of our integrated graphics is by overclocking the BCLK. Increasing the base clock frequency impacts many parts inside the CPU, so we’ll need to adjust other settings accordingly to ensure stability.

Set ASUS MultiCore Enhancement to Enabled – Remove All Limits. That will unleash the Turbo Boost 2.0 power limits and allow unlimited time at maximum performance.

Set DRAM Frequency to DDR5-7750. That ensures that the DDR5 memory runs at a stable near-XMP frequency despite increasing the reference base clock frequency from 100 to 125 MHz.

Set Performance Core Ratio to By Core Usage. Now we will configure the CPU P-core Turbo Ratios such that the Turbo Boost behavior mimics that of a standard Core i9-13900K. We must reduce the CPU core ratios as we have adjusted the base clock frequency from 100 MHz to 125 MHz. For example, the Core i9-13900K can boost up to 5.8 GHz when 1 P-core is active. Typically, the CPU will set a ratio of 58X with 100 MHz BCLK. In our case, with the adjusted BCLK, we will set the 1-Core Ratio Limit to 46X. That will result in a single P-core boost of 1.25 times 46, resulting in 5750 MHz. We set the ratios for each of the active P-core configurations accordingly.

• Set 1-Core and 2-Core Ratio Limit to 46
• Set 3-Core to 8-Core Ratio Limit to 44

Enter the Specific P-Core submenu. Here we will adjust the maximum allowed P-core ratio according to the Turbo Boost Max 3.0 favored cores. In this CPU, Core2 and Core3 are the favored cores and the only ones permitted to boost to 5.8 GHz.

Enter the Specific P-Core submenu

• Set Performance Core0, 1, 4, 5, 6, and 7 to 44
• Set Performance Core 2 and 3 to 46

Set Efficient Core Ratio to Sync All Cores. Just like how we adjusted the P-core Turbo Ratio configuration to mimic the standard behavior of the 13900K, we will do the same for the E-cores.

• Set Efficient All-Core Ratio to 34

Set Max. CPU Cache Ratio to 36. That ensures the Ring frequency will not exceed 4.5 GHz

Set Max. CPU Graphics Ratio to 40. That increases the graphics frequency. There are two essential things to know about the graphics ratio.

First, the UHD Graphics 770 integrated graphics frequency is derived from the base clock frequency but first halved, then multiplied by the graphics ratio. So, in our case, the base clock frequency of 125 MHz is first halved to 62.5 MHz and then multiplied by 40, resulting in a frequency of 2500 MHz.

Second, the integrated graphics consists of three parts: the Slice, the Unslice, and the display block. The Slice holds the Execution Units which power your games; the Unslice holds mostly the fixed-function media capabilities and accelerators like QuickSync. The display block holds the IP responsible for showing you things on the monitor.

On Raptor Lake, the Slice and Unslice frequencies are decoupled, meaning they run at different frequencies. When adjusting the Graphics Ratio, we only change the Slice frequency, not the Unslice frequency. So, our games will go faster, but our QuickSync encoding won’t. That said, the Unslice frequency is still affected by adjusting the BCLK, so this overclocked configuration will still have better QuickSync performance than stock.

Set BCLK Aware Adaptive Voltage to Enabled. That is a crucial setting ensuring the factory-fused voltage-frequency curve is used correctly when overclocking the base clock frequency. The long story short is that the factory-fused voltage-frequency curve maps a voltage against a ratio—for example, 1.175V for 45X and 1.35V for 52X. When the CPU boosts to a high frequency, it references the voltage-frequency curve using the configured ratio to know which voltage to apply. In our case, however, we have increased the BCLK frequency and decreased the CPU ratios. For example, with 125 MHz BCLK, we set 45X to achieve 5.6 GHz. Without enabling BCLK-aware adaptive voltage, the CPU would look up the voltage for the 45X ratio, in this case, 1.175V, then use this for 5.6 GHz. That would obviously not work out well. By enabling this setting, we tell the CPU to account for the adjusted base clock frequency, and the CPU will use the appropriate voltage based on the effective frequency instead of the configured ratio.

Set CPU Graphics Voltage to Offset Mode. That allows us to increase the graphics voltage to support the overclocked frequency. There are two options to adjust the graphics voltage: override mode and adaptive mode. In override mode, we set one voltage applied to all scenarios. In adaptive mode, the voltage scales according to the frequency. When configuring a voltage offset in the BIOS, we program the VccGT voltage regulator directly. Thus, the output voltage will be the voltage according to the factory-fused V/F curve adjusted by our set offset.

Set CPU Graphics Voltage Offset to 0.315. This will increase the maximum voltage of 1.085V for 2100 MHz to about 1.40V for 2500 MHz.

Then save and exit the BIOS.

UHD Graphics 770 Overclocking Performance Improvement

To ensure everything is working as intended, we re-run some benchmarks and check the performance increase compared to the default settings. With the integrated graphics running 50% higher Slice and 25% higher Unslice clock frequency, at 2500 and 1750 MHz, respectively, we see the highest performance in all benchmarks. The performance increase ranges from 19% in EZ Bench to 51% in Furmark.

When running Furmark GPU Stress Test, the average GPU Slice clock is 2500 MHz, and the average GPU Unslice clock is 1750 MHz with 1.400 volts. The average memory clock is 3875 MHz. The average GPU temperature is 61 degrees Celsius, and the average GPU power is 26.177 watts.

And that’s it, thanks for reading and see you next time!