As a lifelong PC enthusiast, I've dealt with high GPU temperatures way more often than I'd like, especially while gaming. In recent years, we've seen high-end GPUs drawing more than 400 watts, which generates a lot of heat and pushes triple-fan cooling solutions to their limits. Even at factory default settings, you'll see temperatures creep into the high 70s during extended sessions. I've experienced this with both my RTX 3090 and 4090, and living in a hot country certainly doesn't help.

That's one of the main reasons why I don't overclock my GPU to squeeze out a few extra frames these days. Instead, I focus on keeping the temperatures as low as possible without sacrificing performance. I've made enough tweaks to shave as much as 10C off my GPU temperatures. Not only is my RTX 4090 cooler, but it runs quieter and maintains its boost clocks for longer. Thermal throttling is now one of the last things I'm worried about. So, let's get right into the tweaks that lowered my GPU temperatures.

Adding more fans for airflow

Installing intake fans at the bottom helped my GPU get more fresh air

Airflow can go a long way in improving your CPU and GPU temperatures. Although my case had adequate airflow, there was still room for improvement, as the bottom vents were unused. It had mounting holes for three 120mm fans, which is more than enough to reduce my GPU temperature by a couple of degrees. So, I bought three airflow fans for under 15 bucks and installed them as intake. As expected, my GPU temperatures dropped by 3C, and the improvement was noticeable during long gaming sessions.

The best part is that I didn't need to make any modifications to my case or disassemble my graphics card. Directing more fresh air straight into the GPU's fans was all it took to get better temperatures. Installing more intake fans also helped me maintain positive air pressure inside the case, which kept dust from building up nearly as quickly. If your case has mounting slots for fans at the bottom, this is a simple, cost-effective tweak that gives immediate results.

Repasting my GPU

A fresh layer of thermal paste made a world of difference

The thermal paste that's pre-applied on your GPU should be effective for the first year or two, but after that, it will start to break down and lose its effectiveness. That's why I always repaste my GPU, especially when it's starting to age and is no longer under warranty. A fresh layer of paste restores proper heat transfer between the GPU die and the cooler's heatsink, which can lower core temperatures by a few degrees and help prevent thermal throttling when you're gaming for several hours.

More importantly, most manufacturers don't use the best thermal compounds on the market, so you can expect better results if you use a high-end thermal paste like Thermal Grizzly Kryonaut Extreme or Noctua NT-H2 once your stock paste loses effectiveness. For instance, when I replaced the stock paste on my RTX 4090 with Thermal Grizzly Kryonaut, my GPU temperatures decreased by 5C. I'll admit it takes time and patience to take your GPU apart for repasting, but the long-term benefits make it well worth the effort.

Undervolting

Lowering the voltage reduces power consumption and heat output

If your case doesn't support more fans at the bottom, or you don't want to risk disassembling your GPU to reapply fresh thermal paste, you'll love this method. All you need is some time and patience to lower the voltage supplied to the GPU using a tool like MSI Afterburner, AMD Software, or Intel Arc Control. The goal is to find the lowest stable voltage that still allows your GPU to maintain its boost clock. The result? Lower GPU temperatures and power draw for negligible performance loss.

Finding the stable undervolt can be time-consuming, as you'll need to test the lower voltage while playing your favorite games. I'd start undervolting in increments of -25mV and run stress tests for stability. If your GPU crashes, you'll need to raise your voltage slightly and repeat the process. I managed to undervolt my RTX 4090 to 1.00V, which lowered the GPU core temperature by 2–3 degrees and reduced the power draw by 35–40 watts. Remember that every GPU is slightly different, and the silicon lottery is a key factor, so your undervolt headroom may vary.

More thermal headroom gives me peace of mind while gaming

These three tweaks together helped me lower my RTX 4090's operating temperature by roughly 10 degrees Celsius. But you don't have to rely solely on these tweaks for better thermal headroom. For instance, you could set a more aggressive fan curve to reduce the peak temperatures. I'm just not a fan of it because it makes my PC louder. Additionally, you can push for a slightly more aggressive undervolt if your GPU has more undervolting headroom; I've seen some users running the RTX 4090 at 0.975V. These two tweaks alone are good enough to lower your GPU temperatures by 5C, which is often enough to avoid thermal throttling and give you that extra peace of mind.