How To Apply Thermal Paste To A CPU

Applying thermal paste to a CPU has to be done carefully. Here is a simple guide on how to do it properly to ensure your CPU temperature stays low.

Prebuilt computers are an excellent option for individuals who have little time to individually purchase and understand how to put together each component.

However, if you want to become part of the PC community and if you want to get the best value out of your money, it is always much better to do a build on your own. Forget about prebuilt systems.

Building your first computer is not going to be easy, and it shouldn’t be, but you will learn a lot.

One of the harder parts of this process is putting thermal paste on the CPU. It might seem easy, but when you have the processor in front of you, you might start asking yourself: How much should I use? Where do I put it? Is it too much? What if it spills? And other questions.

To help you with this scary task, we’ve made this extensive and informative guide for adding thermal paste to any CPU.

Related:The Best Thermal Paste (2023 Reviews)

Table of ContentsShow

What Is Thermal Paste?

applying thermal paste to mobile processor

Before we can get into the details of this topic, it’s probably a good idea to expand on what it is and why CPUs need such a paste at all.

Thermal paste is a compound, a mix of various materials, used to achieve the best possible thermal conductivity. This amazingly thermally conductive compound is then needed to improve the contact between the heatsink (your cooler) and the heat source (your processor).

But why? Why not just connect the cooler to the CPU and begin working, gaming, or whatever activity you desire? Well, that’s because achieving effective contact between two extremely level surfaces is challenging.

The frigid slab (metal slab) on the refrigeration device has flaws, and so does the IHS (the processor’s heat spreader). Both surfaces have tiny breaks, gaps, corners, and crevices. By filling those openings with thermal substance, these two items can create an enhanced physical link, leading to heightened heat dispersion.

However, the thermal paste needs to be applied to the CPU for proper results. To ensure that you get the best results, we’ll explain the best methods to do so.

Why Is Proper Application Important?

AMD Ryzen chiplet design

You may have seen tons of videos and articles claiming “The IDEAL ways to apply thermal paste.” But why is finding the ideal method so important? And, is there truly an ideal method?

Well, it is important because the entire IHS needs to be covered to ensure the best possible thermal performance from the CPU. Not enough thermal paste could potentially throttle the performance of your computer.

Additionally, every processor is different. Specifically, one CPU generation differs from another.

For instance, AMD’s Ryzen SKUs adopt a so-called “chiplet design”. So, rather than only one CPU die (as witnessed previously), it is divided into multiple dies (chiplets). This implies that the heat is emitted from diverse and multiple spots, distinguishing it completely from the way Intel processors expel heat.

In fact, even if we compare Ryzen 3000 to Ryzen 5000, we would probably be able to find differences in heat dissipation.

So, since every CPU is built differently, we have to ensure that the thermal paste is spread out evenly across the entire IHS for the best results.

Pea Method

Pea method on Intel processor

This is probably the most popular method of applying thermal paste to a processor. It is so popular because it is simple and it does the job. At least, most of the time.

With the emergence of fresh varieties of processors and coolers in the market, additional techniques are becoming visible. A few of these techniques prove to be more efficient than others.

To use the “Pea Method” all you have to do is squeeze out a drop of thermal compound from the syringe onto the IHS that is the size of a pea. Remember, apply a steady amount of pressure on the syringe, don’t press on it too hard.

And don’t worry. Even if you get some of the paste onto the motherboard, nothing should happen, as most brands today develop electrically non-conductive compounds.

Still, we suggest verifying to ensure that it isn’t transferable.

Afterwards, cautiously place the cooler horizontally against the processor’s surface. When fastening the screws, ensure they are tightened in a diagonal manner. Tighten a single screw, then the one diagonally opposite to it, and proceed accordingly.

This is done to ensure that the pea-size thermal compound drop is distributed evenly.

Cross Method

Spread method on Intel CPU

Now, this is a more recent method that started showing up after Ryzen came to the market. As we mentioned previously, Ryzen is rocking that chiplet design, so the heat isn’t as centralized as most Intel processors.

The cross method is effective because it considerably improves the chances of spreading the compound evenly. By adding a cross-like shape onto the IHS and tightening down the cooler, the thermal paste will find itself everywhere, surely.

Keep in mind this method can be more wasteful than others, but it may be better to be safe than sorry.

This technique works well with Threadripper CPUs because they have more surface area to cover.

Spread Method

An older alternative that some enthusiasts have been using for years.

The core of this technique is to distribute the compound all over the IHS instead of depending on the pressure of the cooler to do so.

The technique for this method is slightly different as you’ll need an additional tool other than the syringe to do it. That tool is a scraper. Fortunately, many thermal paste products today come with a plastic scraper.

Put a small amount of the substance on the CPU and use the plastic tool to spread it evenly. Be careful not to let it spread over the edges of the CPUs as it may be difficult to clean up afterward.

When you are ready, add the cooler too, tighten all the screws to spread the paste further, and then you can start your PC.

Cleaning The Thermal Paste

For those coming from an already built PC, we think it is a good idea to explain how to clean the thermal paste off the cooler or the CPU (if you plan on reusing them).

Cleaning off the paste is easy. You just need to have some isopropyl rubbing alcohol available. For the best results, we recommend going for 90%+ alcohol, but you could do the job even with lower than that.

First, grab a piece of dry toilet paper and wipe off most of the excess thermal paste. This step is going to make the cleaning process so much easier. With that done, grab a microfiber cloth and dip it in alcohol.

You can try using a coffee filter if you don’t have such a cloth. These are great because they don’t leave any kind of residue, unlike toilet paper. But, it’s fine to use regular toilet paper if you can’t find anything else.

Once your cloth of choice is dipped in alcohol, slowly start wiping the CPU’s IHS or the cooler’s coldplate. You may have to do several dips in alcohol to get rid of all the thermal paste residue.

Graphite Thermal Pad

graphite thermal pad brands and prices

Applying thermal paste can be a complicated matter. Fortunately, you don’t have to do it if you don’t want to. There is an alternative.
The alternative is to use a graphite thermal pad. Currently, the most popular option is Innovation Cooling’s thermal pad.

It completely replaces the need for a thermal compound.

It’s a dry, thin piece of graphite with a mix of other materials that provides solid thermal conductivity and is reusable.

You can find these pads for about $10.

Yes, these pads don’t deliver results as effectively as when using thermal paste, but as you can see, it is still a reliable solution.

Furthermore, incorporating a thermal pad amid the cooler and a CPU (also eliminating it) is significantly more straightforward and easier. Simply align the pad with the IHS, ensure it remains stationary, and then fasten the cooler. No necessity to search for the correct method to apply or detach it.

Conclusion

There are presumably dozens of other methods practiced around the world, but the ones mentioned in this guide have proven to be the most efficient, so there’s no reason to experiment with any other solution.

The conclusion is that you can use any method you want. If you do everything correctly, the changes in temperature with different methods won’t be too significant.

However, if you want to play it safe, we recommend using the cross method as it will always spread the paste evenly across the CPU’s IHS.

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Branko Gapo

Keeping up with the incredibly fast evolution of computer technology is almost impossible. That's why Branko will be using his knowledge on this matter to share news and information on all the latest essential technological innovations and advancements related to CPUs.