We overclock the Ryzen 9 9900X up to 5825 MHz in 5 minutes or less using the ASUS ROG Crosshair X870E Hero motherboard and AIO cooling.

I’ll speedrun you through the BIOS settings and provide notes and tips along the way. Please note that this is for entertainment purposes only and 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 guide.

All right, let’s do this.

5 Minute Speedrun

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

Set Ai Overclock Tuner to EXPO I. That will make the memory run at our EXPO-rated frequency of DDR5-8000 and timings. EXPO I will load only the primary timings and have the motherboard tune the secondary timings.

Switch to the Advanced menu.

Enter the AMD Overclocking submenu. This will provide us with all the advanced AMD CPU overclocking tools.

Click Accept

Enter the Precision Boost Overdrive submenu. Here, we can use the AMD Precision Boost Overdrive 2 toolkit to increase the power, current, and frequency headroom of the Precision Boost 2 boost algorithm.

Set Precision Boost Overdrive to Advanced

Set PBO Limits to Motherboard. This adjusts the PBO platform parameters PPT, TDC, and EDC according to the motherboard auto-rules. On this motherboard, we find that the following values have changed.

Set Precision Boost Overdrive Scalar Ctrl to Manual. That enables us to override the warranted silicon stress level, or FIT, which is one of the Precision Boost limiters governing the maximum allowed operating voltage.

Set Precision Boost Overdrive Scalar to 10X. This increases the FIT to ten times the factory-fused value. Now, the maximum voltage when all twelve cores are active is 1.365V, up 10 mV from the default limit of 1.355V.

Set CPU Boost Clock Override to Enabled (Positive). That unlocks the ability to increase the Ryzen 9 9900X’s programmed Fmax, or maximum frequency, up to 200 MHz in steps of 25 MHz. For dual-CCD Ryzen 9000 CPUs like the 9900X it’s crucial to know that in addition to the CPU Fmax, each CCD has its own Fmax and the override applies to both CCDs independently.

Set Max CPU Boost Clock Override(+) to 200. That increases the CPU Fmax from 5650 MHz to 5850 MHz, the CCD0 Fmax from 5625 MHz to 5825 MHz, and the CCD1 Fmax from 5350 MHz to 5550 MHz.

Enter the Curve Optimizer submenu. Here’s where the real magic happens as curve optimizer allows us to finetune the V/f curve for each core in a positive or negative direction. Each step represents around 5mV. On Ryzen 9000 processors we can set the Curve Optimizer for all cores, per CCD, or per core.

Set Curve Optimizer to Per CCD.

Set CCD0 and CCD1 Curve Optimizer Sign to Negative. This is the best approach for dual-CCD Ryzen 9000 CPUs like the Ryzen 9 9900X because each CCD has its own VFT curve and may have very different undervolting capabilities. We will set a negative curve optimizer for both CCDs. Setting a negative offset means the CPU will use less voltage for a given frequency and boost to a higher frequency at a specific voltage. Note that the Curve Optimizer settings are highly CPU-specific, so you should find the best values for your CPU rather than copy mine. I always try in steps of 5 magnitude.

• Set CCD0 Curve Optimizer Magnitude to 30
• Set CCD1 Curve Optimizer Magnitude to 10

Leave the Curve Optimizer submenu.

Then save and exit the BIOS.

Ryzen 9 9900X Overclock Performance Improvement

We re-run our benchmarks to ensure everything works as intended and check the performance increase compared to the default settings. Higher is better, and all are higher.

The highest Core Clock reported in the operating system is 5827 MHz.

When running the OCCT CPU SSE Stability Test, the average CPU CCD0 effective clock is 5376 MHz and CCD1 effective clock is 5238 MHz with 1.188 volts. The average CPU temperature is 95.0 degrees Celsius. The average CPU package power is 229.2 watts.

And that’s it. Thank you for reading, the Patreons and the YouTube Members for their support, and see you next time!