Your GPU can hit 100% usage and still leave performance on the table

Published Nov 14, 2026, 12:00 PM 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. Whenever we're monitoring gaming performance using something like MSI Afterburner, there's something reassuring about seeing our GPUs sitting close to 100% usage. After all, we're all trying to get the most out of our GPUs and our money's worth, regardless of the games we play or the resolution and graphics settings we use. Sure, some of you may be fine with a slightly lower GPU usage while chasing 200+FPS in competitive titles, but the last thing you want is to fall short of your FPS target while your GPU sits underutilized. Even though seeing GPU usage close to 100% is a good sign that your CPU isn't struggling to keep up with it, that doesn't necessarily mean you're getting all the performance your card is capable of. I know that sounds a bit contradictory, considering how we've always been told to aim for high utilization, but here's the thing. GPU usage only tells you how busy it is, not how efficiently it's getting work done. Your GPU could be hitting its power or thermal limits and running at lower clock speeds while reporting 99% usage. 100% GPU usage doesn't mean max clock speed Both power and thermal limits can affect how high your GPU boosts One thing I learned early on from monitoring performance using MSI Afterburner is that GPU usage and clock speed don't necessarily go hand in hand. Yes, GPUs do adjust their clock speeds depending on the workload, so if you're seeing low GPU usage in a less demanding competitive shooter, there's a good chance your card is running below its advertised boost clock. But workload isn't the only thing that can affect your GPU's boost clock, which is why you shouldn't assume a GPU pinned at 99% usage is running at its highest boost clock either. Remember, just like your CPU, your GPU has to operate within certain power and thermal limits. It can dynamically adjust its clock speeds depending on how much headroom it has. Nvidia's GPU Boost algorithm does exactly this. For example, my RTX 4090's thermal limit is 90C, but GPU Boost can start lowering its clock speed well before it reaches that threshold to keep temperatures under control. Likewise, if you have a 450W GPU, the boost algorithm is going to do everything it can to stay within that limit unless you manually raise it using MSI Afterburner. Regardless, my point is that GPU usage alone isn't a good indicator of how hard your GPU is pushing itself. You can still run out of VRAM at 100% usage And that can hurt your FPS and frame times GPU usage doesn't tell you whether your GPU has enough VRAM for the game you're playing. Let's say you have an RTX 5060 Ti 8GB variant and your friend has the 16GB variant. Both cards are essentially the same GPU, but they can perform very differently even at the same 99% GPU usage. That's because when the 8GB variant runs out of VRAM, which can easily happen in newer AAA titles at 1440p, it usually needs to fetch game data from system RAM over PCIe, which is considerably slower than accessing VRAM. What's the result, you ask? Significantly lower frame rates, terrible 1% lows, and frequent stuttering whenever the game needs to access data that isn't already in VRAM. And the frustrating part is that your friend's 16GB card could be running the same game at the same settings without any of these issues, despite both GPUs reporting the same utilization in Afterburner. Now, running out of VRAM can very well cause your GPU usage to fluctuate, but you may not always notice those brief drops while you're focusing on the game. Tell XDB what you want the PC to do and how much you want to spend. We'll find parts that fit, with current prices. What will you use it for? Pick any Games or apps Optional Budget But isn't 100% GPU usage exactly what we want? Usually, it is, but it shouldn't be the only thing you care about To be fair, your GPU sitting close to 100% usage is usually a healthy sign that no other component in your build is holding back its performance. More importantly, it means your CPU is feeding the card fast enough to keep it busy. I'd gladly take that over the CPU bottleneck I had to deal with when I first paired my RTX 4090 with a Ryzen 9 5900X. Unless you're playing with an FPS cap or using V-Sync, I don't think anybody wants to see their GPU usage sitting at 70% while not hitting their FPS target. Even though GPU usage has always been the metric I've relied on to identify bottlenecks, you shouldn't be treating it as the be-all and end-all of gaming performance. There's really no point chasing the highest possible reading when it doesn't necessarily translate to better smoothness or responsiveness. When I'm playing fast-paced shooters like Battlefield 6, I'd rather turn down a few settings to reduce rendering time than worry about keeping my GPU pinned at 99%. Don't forget that heavy GPU loads can also increase latency when frames start queuing up, which is why features like Nvidia Reflex make a difference. Look at the bigger picture instead of fixating on one metric You can keep monitoring GPU usage like you always used to. I'm not trying to stop you from doing so. In fact, I have no problem admitting it's one of the first metrics I check in MSI Afterburner because it's still a good starting point. However, you also need to zoom out and look at what the rest of your GPU's metrics are telling you, especially when you're not hitting your FPS target. There's no point celebrating 99% usage if you're still dealing with frametime spikes and stutters.