1025mV - 1050mV (Start at 1050mV and work down). Max Frequency: 2400MHz - 2500MHz
A common mistake users make is setting the "Max Frequency" to 2700Mhz. While the 6800XT can technically hit that at stock voltage (1.2V), it cannot hit that voltage at 1.050V.
Finding the Sweet Spot: Do Your 6800 XT Undervolt Settings Actually Work?
The best tool for this, allowing you to edit voltage, frequencies, and fan curves in the "Performance" -> "Tuning" tab. 6800xt undervolt settings work
Based on popular user experiences in 2026, many find success with a combination of moderate overclock and aggressive undervolt: 1030mV - 1075mV Max Frequency: 2500MHz - 2650MHz VRAM Frequency: 2100MHz - 2150MHz (Fast Timing). Step-by-Step Methodology: How to Make it Work Open Adrenalin: Go to Performance > Tuning . Enable Manual Control: Set "Tuning Control" to Custom . Enable Advanced Control: Turn on Voltage/Frequency.
Undervolting works because of a fundamental law of silicon manufacturing: silicon lottery. AMD designs the Big Navi architecture to run safely under worst-case scenarios.
Enable , Advanced Control (set max frequency), and Voltage . Enable Power Tuning and set the slider to Set the Voltage (mV) to as a starting point. Set Max Frequency (MHz) to Click Apply Changes . Stability Testing: Does it Actually Work? 1025mV - 1050mV (Start at 1050mV and work down)
Concrete starting points (use as a template; adjust per card):
The Aggressive Power-Saver (Best for Small Form Factor Builds) 2200 MHz Max Frequency: 2300 MHz Voltage: 1000 mV–1025 mV Memory Tuning: Enabled (Default Timing, 2000 MHz) Power Limit: 0% Step-by-Step Guide to Applying Settings Step 1: Prepare Your Tools
Enable Memory Tuning, switch to Fast Timing , and gently bump the memory frequency from 2000 MHz to 2100 MHz . This recoups any minor performance loss from the undervolt and often results in a net performance gain over stock settings. Signs of an Unstable Undervolt Finding the Sweet Spot: Do Your 6800 XT
Flashing lights, missing textures, or strange colored blocks appearing on the screen.
While every single GPU chip behaves differently, community testing across hundreds of Big Navi cards has established a reliable baseline. Use the AMD Software: Adrenalin Edition to apply these values. The Balanced Blueprint (Best for Most Users) 2300 MHz Max Frequency: 2400 MHz Voltage: 1050 mV (Stock is usually 1150 mV) Memory Tuning: Enabled (Fast Timing, 2100–2150 MHz) Power Limit: +15%