PCWorld (USA)

How to keep your gaming PC cool for best performanc­e

Keep your PC cool with these tips on how to lower the temperatur­e.


The desktop PC has two major nemeses: dust and heat. Heat can be tough to diagnose since you can’t see it the way you can with dust. The key to avoiding any heat-related issues (besides regularly cleaning your PC [ go.pcworld.com/clnp]) is sticking with some tried-and-true principles of cooling. If you follow the basics, then adapt them to your local environmen­t and the demands of your PC, you should be just fine.


The best way to easily measure if your PC is getting too hot is to monitor the temperatur­es reported by the CPU and GPU. If these two components are staying within their

recommende­d temperatur­e ranges, then everything else should be just fine.

For CPUS, this means keeping your processor under 80 degrees Celsius (176 Fahrenheit) when under load, but preferably much lower. A specific CPU’S maximum operating temperatur­e is often higher than that, but this is a good general benchmark.

There are many programs that let you monitor CPU temperatur­e, but we recommend Core Temp ( go.pcworld.com/ crtm), as it’s a lightweigh­t program that does its job well. It will also report a temperatur­e reading for each CPU core that you can see at a glance in your PC’S system tray.

Graphics cards can get slightly toastier than the processor, but ideally they’d stay under 85 degrees Celsius (185 Fahrenheit). AMD and Nvidia’s native software overlays can report your graphics card’s temperatur­e. Another option that will work for everyone is MSI’S Afterburne­r ( go. pcworld.com/aftr).

For more detailed explanatio­ns, see our guides on how to read your PC’S CPU temperatur­e ( go.pcworld. com/cput) and GPU temperatur­e ( go.pcworld.com/gput).


PC cooling starts with two case fans. You can have more than that, but you want at least two. Some cheaper desktops or PC cases only come with a single fan; you’ll want to install another fan ( go.pcworld.com/infn) if that’s true of your system. One needs to be for intake that brings cooler air into the case. The other is for outtake or moving hot air out of the case. (Here’s how to tell which way your PC fans are blowing [ go.pcworld.com/fblw].) Having a single fan doing just one of those things will significan­tly increase temperatur­es.

Where these fans are situated depends on the case, but the outtake fan is usually positioned toward the back of the case, near the CPU. It can also be at the very top of the case, right above the CPU. This placement make sense because the CPU is outputting a lot of heat that needs to get out of the case, and the other major heat generator, the graphics card, is just below that.

The intake fan should ideally pull cool air in from the front of the case, away from where

the hotter components (and air) are. This all depends on your case, however, as your case design dictates fan placement.

If you only have a limited number of fans and they’re not doing their job, an alternativ­e is to look at pulse width modulation (PWM) fans. These fans, which require a compatible PWM header on the motherboar­d, make it possible to control the speed of the fans via software or your motherboar­d BIOS. This enables the fans to speed up when it’s too hot and slow down (or even stop) when they’re not needed. PWM fans are used on graphics cards for better power efficiency and cooling, and they can do the same for your system cooling needs.

You can find a basic no-frills PC case fan ( go.pcworld.com/nofr) for as little as $5 on

Amazon. Antec’s whisper-quiet P12 case fans are an in-house favorite and you can get not one, not two, but five for under $25 ( go. pcworld.com/un25). Meanwhile, if you want to add a little bling to your setup, you can also buy a five pack of Antec fans with RGB lights ( go.pcworld.com/5rgb) and PWM support for $60. Our guide to installing case fans ( go. pcworld.com/infn) has all the informatio­n you need to pick out the right kind for your particular setup.


Case fans are used to achieve one of several situations: positive pressure, negative pressure, or an even balance between the two. Positive pressure is when there is more cool air entering the case than exiting via the outtake fans. Negative pressure is the opposite.

PCS built without much attention to fan placement or direction usually end up with a positive pressure environmen­t. That’s because there are so many cracks, crevices, and unused vent holes in a PC case where air can enter. To get a negative pressure setup, where more air is pushed out than pulled in, you need to really think about fan placement and spin direction. You want most fans (if you have more than two)

blowing outward to push all that hot air away from your components.

Which kind of pressure you want really depends on your needs. Some people in drier environmen­ts, where dust accumulate­s easily, swear by a negative-pressure environmen­t for their PC. Other people aim for a positive airflow. An even flow of positive and negative pressure is the best bet for most people, however. When you have enough air moving through the case from the outside, while pushing really hot air out, you get the benefits of reducing dust accumulati­on while keeping the air moving. The key, however, is to make sure that you have filters near the intake fans to prevent too much dust from coming in with your air. If there aren’t built-in filters for your case, you can often make your own filters without going to too much trouble.


The key to any cooling setup beyond fans and airflow is the cooling devices you use for your GPU and CPU. Graphics cards come with their own fans. While you can upgrade a GPU to liquid cooling ( go.pcworld.com/uplc), that’s an advanced topic—and an expensive one if you mess up. Most people leave the GPU cooling as it is and look toward improving the CPU cooler.

Many CPUS come with a stock cooler, or if you’re on a budget you might grab the cheapest serviceabl­e CPU cooler you can find. But going the cheap way on the CPU fan

is a mistake, because getting a better CPU cooler can help keep overall system temperatur­es lower. A better cooler can absorb more heat and direct it toward outtake fans, making the entire system more efficient. The problem with better CPU coolers is they can often cause problems for cases with low clearance. If they are oriented incorrectl­y, a large cooler may also prevent proper installati­on of your RAM.

One effective alternativ­e to standard CPU coolers is the all-in-one (AIO) liquid cooler. An AIO removes any worries about clearance, and most cases have space for the fans an

AIO requires. A dual-fan AIO is an excellent choice for keeping your CPU cool, and these days they often cost about the same as a high-end air cooler.


If improving your case fans, adjusting negative versus positive pressure, and better component coolers don’t help your situation, there are more possibilit­ies.

First, it may be that your case simply isn’t ideal for your system. Consider buying a new case that prioritize­s cooling with better airflow and more space for fans. You may even have to give up on having a transparen­t side in exchange for more vents and spots for fans. Our topic explaining how to buy a PC case ( go.pcworld.com/ bpcs) can help you find the best case for your situation.

Also consider the ambient temperatur­e in the room. Moving the PC to a room with air conditioni­ng, if one is available, or a room in a below-ground basement is a good idea. If neither is an option, the old trick of pointing a floor fan at an intake filter can be surprising­ly effective.

Keeping your PC cool is not always a simple affair, but for most people who aren’t doing extreme overclocki­ng with their systems, these steps should be enough to keep things from overheatin­g.

 ?? ??
 ?? ?? A stack of Arctic P12 case fans.
A stack of Arctic P12 case fans.
 ?? ?? Antec’s RGB fans look great and will keep your PC nice and cool.
Antec’s RGB fans look great and will keep your PC nice and cool.
 ?? ?? This illustrati­on shows the flow of air through Lenovo’s Legion
This illustrati­on shows the flow of air through Lenovo’s Legion C530.
 ?? ?? The Noctua NH-D15 CPU cooler.
The Noctua NH-D15 CPU cooler.
 ?? ?? As a final resort, you may need to replace your PC’S case.
As a final resort, you may need to replace your PC’S case.

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