However, the surfaces of the component and the heat sink are not perfectly smooth, and air can become trapped in the gaps and imperfections between them. The heat sink absorbs the heat and dissipates it into the surrounding environment. To prevent overheating, a heat sink is typically attached to the component. Its primary purpose is to fill in microscopic gaps and imperfections between the mating surfaces of the component and the heat sink, which helps to maximize the transfer of heat from the component to the heat sink.When a computer component, such as a CPU, operates, it generates heat. Want to upgrade your CPU cooler at the same time as re-applying the heat paste? Here are our favorite AIO water coolers for easy installation.Thermal Grease Thermal paste, also known as thermal compound or thermal grease, is a substance used in computer systems to improve the thermal conductivity between a heat-generating component, such as a central processing unit (CPU), and its heat sink. They don't tend to offer as strong performance as the best heat pastes, but for peace of mind and ease of use, they win hands down. ![]() That lets them transfer heat from the CPU to the cooler efficiently, but without the chance of drying out or degrading, so performance should remain the same for years to come. Thermal pads perform the same job as heat paste, but they're a malleable material with strong thermal conductivity. However, if you don't want to re-apply heat paste at least once every couple of years, you could opt for a thermal pad instead. You have to have something to fill the gaps in between the cooler and the processor, and heat paste is the most common and effective solution. Thermal Grizzly Do you have to use heat paste? ![]() Need help with that? Here's how to check your CPU temperature. Typically, your thermal paste will last you quite a while, but keep an eye on your temperatures, as if they start to rise, it could be a sign your thermal paste is drying up. Intel recommends reapplying the solution "every few years" or if you remove your cooler for any reason. This one is up to you, as some leave their heat paste for years at a time without much issue, and some replace it every year. Step 4: Now you can move on to applying new heat paste, as per the section above. Step 3: Repeat the above process to remove any old thermal paste that may be stuck to the underside of your CPU cooler. If you like, you can use cotton swabs soaked in isopropyl alcohol to remove any errant bits of heat paste that are proving tricky to get to, but you don't have to. Step 2: Place the microfiber cloth over the end of the isopropyl alcohol bottle and upend it until some of it has saturated the cloth, then wipe the CPU down until all the old heat paste has been removed. Step 1: Begin by wiping the top of your CPU with the microfiber cloth to remove as much thermal paste as you can without issue. Before beginning, ensure that the CPU cooler has been removed, and you can visually see the thermal paste it is generally white or gray. If you already have a working machine that needs thermal paste to be reapplied, you'll first need to clean off the old thermal paste. Step 3: Once the cooler is installed, check the CPU's edges to see if any excess thermal paste has spilled over, and, if needed, wipe it away with a microfiber cloth or paper towel. I’m building a new PC - here’s how I chose the components for it Note that there is no need to first spread the paste before installing the cooler the cooler's pressure will evenly distribute the thermal paste. Step 2: Next, install the CPU cooler while applying top-down pressure to the unit. Step 1: Install your CPU in the motherboard if you haven't already, then use the plunger on the tube of thermal paste to squirt a pea-sized amount in the center of the processor. As long as you aren't using a conductive heat paste, however, putting on too much won't break anything, it'll just be messy and in extreme cases, can cause your cooler to actually be less effective. The key to applying thermal paste is not to overdo it you only need to use a small, pea-sized bit of paste – anything more would be excessive. ![]() If they aren't clean, and have old hea tpaste on them, scroll down to the section on how to clean your CPU first. If your CPU and cooler are clean and ready to go, we can jump right in to applying new heat paste. Bill Roberson / DigitalTrends How to apply thermal paste
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