When your CPU temperatures start creeping into the mid-80s, it's hard to resist the temptation of replacing your stock thermal paste with a premium aftermarket one like Thermal Grizzly Kryonaut or Noctua NT-H2. After all, it almost feels like a guaranteed way to drop a few degrees without changing anything else. You remove the cooler, apply a fresh coat of paste, and expect instant results. And considering it typically costs around $15, it seems like a small price to pay for what you get in return.

But the thing is, in most cases, your thermal paste isn't the reason your CPU is running hot in the first place. CPUs these days boost aggressively and operate close to their thermal ceiling, so they have no trouble sitting in the 80s under sustained loads. In my experience, I've seen bigger temperature drops from undervolting, correcting mounting pressure, or improving case airflow than I ever have from switching between popular thermal pastes. That's why it's worth making sure everything else is dialed in before you order new thermal paste.

Start with undervolting your CPU

Stock voltage behavior is often more aggressive than necessary

Out of the box, both Intel and AMD desktop CPUs prioritize performance over efficiency. The stock voltage settings are deliberately conservative to guarantee stability across varying silicon quality. That means your CPU is likely getting more voltage than it needs to maintain the same clock speeds. And as you probably know, the higher the voltage, the higher the power consumption, and the more heat generated by your CPU that your cooler has to deal with. That's exactly why undervolting is a great place to start. By lowering the voltage slightly, you're basically trimming excess voltage that exists for worst-case silicon quality.

On Ryzen CPUs, you can use Curve Optimizer to apply a negative offset to reduce voltage while keeping boost behavior intact. On Intel CPUs, a small adaptive or offset undervolt in the BIOS can get a similar result. This often results in a 2–5C drop in temperatures without any hit to gaming performance. In fact, it allows your CPU to sustain its peak boost clocks for longer, since it isn't hitting thermal limits as quickly. However, if you're too aggressive with your undervolt, you may run into crashes or lose performance, so it's important to take your time and run proper stability tests.

Make sure your cooler is mounted properly

Mounting pressure and cooler contact matter more than better thermal paste

You can use the best thermal paste on the market, but if your cooler isn't applying even pressure across the CPU's IHS, your temperatures will still look worse than they should. At the end of the day, the main purpose of thermal paste is to fill microscopic imperfections between the CPU's heat spreader and the cooler's cold plate. It's not going to compensate for poor mounting pressure or uneven contact. So, if one side of the cooler is slightly tilted or unevenly tightened, heat transfer will be inconsistent, regardless of how well you applied the paste.

This is a common issue people deal with after installing dual-tower air coolers or AIOs, since mounting pressure has to be applied evenly across multiple screws. If you tighten one screw all the way or skip the recommended cross pattern, you can create uneven contact without even realizing it. Some CPUs are also very sensitive to mounting pressure, which is why contact frames for LGA 1700 sockets are so popular. Manufacturers like Arctic even include contact frames with some of their coolers to address pressure distribution and IHS warping concerns.

Don't let airflow restrict your cooler

Without enough fresh air, your cooler will always struggle, regardless of the paste

Even the best air coolers and 360mm AIOs can only perform as well as the air they're working with. If your case isn't feeding it enough fresh intake air, you're effectively asking it to cool your CPU using warm, recycled air. At that point, even a paste with a high thermal conductivity won't make a meaningful difference in your CPU temperatures. Keep in mind that your cooler's performance depends heavily on the temperature of the air passing through its heatsink or radiator.

So if you have a case with solid front panels or restrictive dust filters, your cooler is already at a disadvantage. On top of that, if your fan configuration has created a negative pressure setup, the case may pull in warm air and dust from every unfiltered gap instead of feeding your cooler fresh intake air consistently. That's one of the reasons I highly recommend maintaining a slight positive pressure, i.e., having more intake fans than exhaust fans. It's also worth cleaning your dust filters and front intake areas regularly, since even minor airflow restrictions can quietly raise CPU temperatures over time.

Don't repaste until you have everything else dialed in

I'm not saying repasting won't help improve your CPU temperatures, but if that's the first thing you do, you're probably treating it as a workaround for a bigger issue instead of addressing the root cause. If anything, you're chasing the smallest variable in the equation while ignoring voltage behavior, mounting pressure, and airflow, which have a far bigger impact on thermals. Unless you're sure your thermal paste has dried up after a couple of years of daily use, repasting shouldn't be the first thing you consider when your temps look higher than expected.