How to Undervolt Your ASUS Laptop with G-Helper — Step-by-Step Guide

Here is a step by step guide on how to undervolt with G-helper. Undervolting is the act of giving you CPU less energy than its programmed to get. If your wondering how to get the very most out your ASUS laptop’s battery life, then Undervolting is definitely something to consider. You might be asking – Wouldn’t giving the CPU less power make your computer slower? No, it wont (If you do it right). In this guide Ill go through what Undervolting is exactly, and how to use it safely within your ASUS laptop.

What does Undervolting actually do?

Before we learn what undervolting actually is, we need to understand a specific concept about CPU wattage. Whenever a new CPU is made, its automatically programmed to receive extra wattage by its manufacturer. This is more of a safety mechanism – but in reality most chips can perform well under their preset amount. undervolting is purposefully lowering your CPU’s wattage, in order to save some energy without losing essentially any performance at all.

Is Undervolting Safe?

Before we get into the meat, please understand that software-based undervolting (specifically with G-Helper in this case) can not cause any permanent damage to your components. If you do go full throttle and end up pushing it too much, the worst that can happen is a crash or freezing of your computer. This is essentially a setting only used by G-Helper, so turning off the app will return performance back to normal.

Step 1: Open the Fans + Power panel in G-Helper

In this guide we’re going to be using G-Helper, a free app used to edit laptops and tweak specs with ease. If you don’t have G-helper installed, you can check out my installation guide here.

To get started, open up G-Helper from your sidebar, and go over to the Fans + Power section. Opening this up will allow us to see the menu with all the control over our hardware.

Step 2: Start off safe

In this menu, click the advance section and make sure you have the extra part of G-Helper downloaded. Once you see something similar to the image below, you know your in the right section

As seen on the left of the image, the Undervolt section will be a simple slider, which you can choose to you liking – but be careful to not go to far. As seen in the image, I have my ASUS Zephyrus (2024) set to -15W of Undervolting, which is a pretty safe amount. From personal testing some CPU’s can see glitches anywhere farther than -20 Watts, I’d recommend to start off within that range.

Step 3: Stress test for stability

Now that your laptop is undervolted, I recommend to test it right away as each CPU can perform slightly differently. For this we’re going to use a tester called Cinebench, it’s a free app that allows you to push and test your CPU at 100% performance. Go ahead and download Cinebench (Cinebench 2024) on your laptop then come back here. Quick tip before you test – Make sure your charger is plugged in, with the highest power settings, so the CPU voltage won’t be limited. Once it’s downloaded choose the Multi-Core test, while making sure your undervolt is active. The test will take around 10 minutes, but make sure to pay attention for any crashing or glitches which would indicate your undervolt it too extreme. If it passes without any of these, then congrats! Your CPU is now more power-efficient. If you feel like getting the most out of it, you can push the undervolt a bit higher and test again, but discretion is advised.

My personal results from the stress-test

Here’s the data I got from my ASUS G16 Zephyrus with a Ryzen AI 9 HX 370

• No undervolt: 1158 Points, 95C CPU
• -20W : 1208 Points, 95C CPU – +4.3%
• -25W : 1256 Points, 95C CPU – +8.5%
• -30W : 1241 points, 95C CPU – +7.2%

What do these results mean?

It seems that at max CPU usage, undervolting it will actually increase its performance, as it lowers the rate of thermal throttling occurring (This is when the CPU reduces clock speed due to overheating). This means my CPU was able to perform better with less energy, since the extra wattage that was given to it was simply overheating it while not adding to performance.

Step 4: Find the sweet spot

As seen in my test, undervolting allowed for an increase in CPU performance, giving stronger performance at max temps. Since my CPU performed the best at -25W (8.5% improvement in performance), I will be using that instead of my previous safe amount of -15W. If you also wish to find the sweet spot for yourself, take some time to run Cinebench at these different values, selecting the one that performed the best for you! (Remember each CPU can be different so don’t just copy mine). Look out for any crashes or glitches, as that would mean you’re pushing it slightly too far.

Undervolting is a wonderful free tool that any supported ASUS laptop user can take advantage of to limit the wastage of battery life, or even reduce the thermal throttling at max temps. Take the time to find your chip’s limit, and post any results in the comments! Would love to see what specs worked out for you guys. If you’re looking to increase your battery life in other ways, check out my Guide to G-helper fan curves (You’ll be surprised how much energy they waste).