Undervolting my Ryzen 7 5800X3D taught me that lower voltage doesn't have to mean lower performance

Published Nov 9, 2026, 10:00 AM EST Hamlin has been in the tech field for over nine years. Since 2017, his work has appeared on MakeUseOf, Android Police, OSXDaily, Beebom, and more. He served as the Senior Editor at Valnet's MakeUseOf for over two years before joining XDA. He uses a high-end gaming rig for desktop use and a MacBook for traveling, but dislikes some of the quirks of macOS. You're more likely to catch him at the gym or on a flight than anywhere else. I still remember undervolting my 5800X3D for the first time last year because I wasn't happy with the temperatures I was seeing while playing Battlefield 6. Whether it's my CPU or GPU, I start freaking out when temperatures exceed 80C, so when I saw my 5800X3D hit 85C after 20 minutes of gaming, I knew I had to do something about it. Sure, you could argue AMD rates it for up to 90C, but the last thing I want is my CPU brushing against its thermal limits. The first thing I did was repaste my CPU, which improved temperatures by a mere 2 degrees. Of course, I could've set up an aggressive fan curve, but I didn't want to hear my fans through my headset while I was trying to listen to footsteps. That's what convinced me to give undervolting a shot using PBO2 Tuner. I was hoping it'd at least bring temperatures down to 80C, but seeing my clock speeds improve slightly? That wasn't on my bingo card. You'd think lowering voltage would lower clock speeds But your CPU probably doesn't need as much voltage as it gets out of the box Here's the thing about CPUs these days. Both Intel and AMD play it safe with the stock voltage-frequency curve because they have to account for varying levels of silicon quality between individual chips. So, one CPU might need slightly more voltage than another to maintain the same clock speed. And since manufacturers have to ensure stability across different workloads and operating conditions, they don't assume every chip will run fine at lower voltages. As a result, your CPU might be getting more voltage than it actually needs. By undervolting slightly, you're basically just trimming that excess voltage to reduce the power your CPU consumes and the amount of heat it generates. If your CPU can maintain the same clock speeds with less voltage, why feed it more than it actually needs? That's why undervolting is so appealing, and I think it's worth a shot as long as you're cautious, make gradual adjustments, and test for stability. You may not have as much headroom as others, but you won't know unless you try. Sometimes, it's the other way around Lower temperatures can actually help your CPU sustain higher boost clocks Whether you have an Intel or AMD CPU, it dynamically adjusts its clock speeds based on factors like temperature, power consumption, and current limits. So if your CPU is approaching its thermal limit, like my 5800X3D was when it was running at 85C in Battlefield 6, it may lower its boost clocks before actually reaching its maximum operating temperature. And since you're reducing power consumption and heat output by lowering the voltage, you're giving your CPU more headroom to boost higher. Of course, that doesn't mean undervolting will push your CPU beyond its advertised boost clocks, but if your CPU was being held back by temperature or power limits, this could make a difference. By applying a negative Curve Optimizer offset, I was essentially telling the CPU to request less voltage at a given frequency. And that was enough to help my 5800X3D sustain higher boost clocks because it didn't have to deal with as much heat. So, a cooler CPU that also runs a bit faster? I'll take that. Stability testing is time-consuming, but non-negotiable Even a modest undervolt can make all that effort worthwhile, though If there's any drawback to undervolting, it's that you can easily run into stability issues. For instance, I set a -30 curve offset in PBO2 Tuner for my 5800X3D, but that doesn't mean you can simply copy my settings and expect them to work on yours. Remember, every chip is different, and yours may not have the same headroom as mine. That's why I suggest starting with a -10 offset and gradually working your way down in steps of 5, testing for stability after each adjustment. I know this could take several days, especially if you're hell-bent on finding the sweet spot for your CPU. You can't assume everything is fine just because you can play games for hours without crashing. But here's how I look at it. You're spending a few days tuning a CPU that you'll probably use for years. Once you find what works best for your CPU, you can note that down and forget about tweaking it again unless you run into stability issues later. Or, you can settle for a modest undervolt, which can still bring down temperatures without sacrificing performance. I'd recommend undervolting any day of the week Undervolting is just one of those tweaks that has almost no downsides, as long as you're careful and check for stability. Unlike overclocking, you're not pushing your CPU harder to squeeze out a bit more performance. You're trimming excess voltage to make your CPU run more efficiently, and in return, you can benefit from lower temperatures and higher sustained boost clocks. And to be fair, I'm sure many of you would rather tweak some settings and improve temperatures than take your cooler off and repaste your CPU.