Undervolting
We’ve finally arrived at the main topic of the article. We apply a tweak based on the AMD Radeon Control panel and roughly the same settings as we did without regular tweaks. We'll lower the voltage curve, as these AMD Radeon cards are like that.
Our goal here is to reduce GPU voltage without compromising system stability. The adjoining graph shows how our AMD Radeon RX 7800XT maxes out at 1150 mV. Depending on the quality of the silicon on your graphics card, you should easily be able to run it at a significantly lower voltage without any issues. Begin by increasing the power limit to its uppermost value for this card, which is +15%. Adjust the minimum clock to 2750-2800. Refrain from setting it exceedingly high. If, during testing, the clocks appear to hover around this figure, you can incrementally increase it to 3000 or even 3250. This setting doesn't define the minimum clock but is a reference for AMD's clocking algorithm in the frequency curve. Gradually decrease the maximum voltage. Monitor the card's stability while running benchmarks or games. With RDNA3, undervolting is essential as it provides additional power leeway for the clock algorithm, promoting higher frequencies. Typically, these cards become unstable around 975~1000 mV.
The default setting is 1.15 V, so there's leeway to play with. After determining your optimal voltage, increase it by 25 mV to safeguard against GPU clock instability. Typically, these cards become unstable around 975~1000 mV. It is time for the most tedious part of UV: stability testing. For this, it is best to use demanding games (like CyberPunk 2077) or applications for 3D graphics (like 3D Mark) or video processing.
