# Geeks Weigh In: Does Cooling The CPU In Laptops Make a Difference?

24-12-2009

Today, with the massive popularity of mobile computing, many people find themselves using laptops in locations and conditions that they might never have considered before. With more powerful Wi-Fi technologies, people can sit out on the deck on a warm summer day to cruise the net or chat on Facebook. With higher speed capabilities over cellular data networks, people can sit on a boat in the middle of a lake and shop on eBay or Amazon. This is the amazing world in which we live – but with convenience comes complications.

Once, while we were sitting on the beach at camp using our laptops, my wife turned to me and asked, “Does it hurt the computer for it to warm up a little bit in the sun?” My knee-jerk reaction was to say that it doesn’t make a bit of difference. Then, a few memories from some of my engineering college classes came back and I remembered that as temperature rises, electrical conductance drops and components can degrade more quickly than normal. The real question is how much do those laptop cooling pads that you can place under your laptop for cooling the CPU really help?

Today, I’m going to take a scientific look at that question and see if we can’t quantify the answer – something you can point to any time any of your friends ask you whether or not cooling the CPU really matters.

### The Method & The Measurement Tools

There are two variables to measure here – CPU temperature and cooling power. The experiment that I’m going to do in order to check for the correlation between those two variables is to benchmark the temperature profile of my Sony Vaio during normal operating conditions in my living room. Then I’m going to attempt to lower the core temperature of my laptop by using a USB powered cooling fan for 5 minutes and then for 10 minutes, and take additional benchmarks.

Choosing the measurement tool was easy – I just turned to my trusted source for free software, MakeUseOf!  The best application for this purpose is SpeedFan to measure temperature (reviewed earlier Monitor Your Computer Fan Speed With SpeedFan Read More by Kyle). First, to take a baseline of the normal operating levels of my CPU temperature, I’m going to take a snapshot of all temperatures as well as a graphical snapshop of the core temperatures. First, SpeedFan displays my current CPU temperature as shown here.

As you can see, the temperature of my Duo Intel Core processor averages about 36 degrees Celsius (96.8 degrees F). Next, I switched to SpeedFan’s charting feature for a short history of the core temperature range.

The core temperature range is from 35 to 37 degrees F, and this is with seven windows open, including an online radio stream. I’m going to see if I can increase my core temperature at all by opening up a YouTube video stream, Microsoft Word and a few additional Internet browsers.

By opening multiple windows and Internet streams, you can see that my core temperature has gone up a few degrees to about 39 degrees F.  As you can imagine, some people open a large number of applications and windows without realizing the effect that doing so has on the work required from the processor and the resulting temperature increase for that component.

### Experiment #1 – Cool Laptop For 5 Minutes

In this first test, I’m going to cool the laptop itself (and in effect the core temperature as well) of the laptop for a total of 5 minutes. For cooling the CPU, I’m using a USB powered notebook cooler pad rated with an air flow of 28 CFM and dual fan speed of 1500 rpm. Hypothetically, this should obviously cool the CPU even though the demands of multiple applications have driven the core temperature up. Let’s give it a shot – I’ll see you back here in 5 minutes.

Whew…okay that wasn’t too bad. The laptop doesn’t feel a lot cooler, but let’s take a look if I’ve chilled the Intel Duo Core at all.

Sure enough, five minutes using the cooling fan pad dropped the core temperatures from almost 40 degrees Celsius down to just over 37 degrees Celsius. While this is only a 3 degree drop in the core temperature, such a differential can really make a difference in the life of the processor.

Ideally, I’d like to see the fan bring the processor temperatures down to normal operating temperatures even with the additional applications open, but even after 10 minutes of cooling you can see that it just isn’t possible (at least not with this particular cooler).

It appears that while cooling the CPU of a laptop using these cooling fans certainly does make a difference, the cooling ability is limited by the device itself such as the airflow and fan speed.

### Experiment #2: Cool Laptop Under Normal Operations

Motivated by the very clear results from the experiment above, I wanted to see how much cooling the fan under my original “normal” use conditions would help with CPU temperature. Once I closed down the YouTube video stream, the extra browser windows and the Microsoft Word app, I applied cooling for another 10 minutes and then checked the core temp history using SpeedFan again.

In this case, the ability of the cooling fan to cool the CPU was even more dramatic. While I was originally operating just under 37 degrees Celsius, using the cooling pad dropped my normal core temperature all the way down to almost 32 degrees Celsius – a significant 5 degree drop in core temperature. Given that any increase in temperature can shorten the life of electrical components over the long term, this 5 degree drop could have a very positive cumulative effect on the life of your laptop CPU.

The conclusion from my own testing is that yes, cooling the CPU in laptops does make a difference. Now it’s your turn – what do you think, do you think using a laptop cooling pad makes any difference in the life of your laptop? Share your thoughts in the comments section below.

Explore more about: Computer Maintenance, CPU, System Monitor.

1. Aibek
January 1, 2010 at 11:17 pm

nice post Ryan!

2. MikeVertx
January 1, 2010 at 5:41 pm

from experience we learned our lesson the hard way.

in doing a marketing promotion we had a set of 4 laptops out on display for consumer interaction and each one began failing and overheating as they were getting direct sunlight on a very hot day.

We having difficulties with them turning off, not working, becoming too hot to touch...after putting cooling pads with dual fans under each laptop things worked much smoother.

3. Dex
December 26, 2009 at 4:13 am

My 2 cents about it is if it works for a desktop, why not also for a laptop too. Look at overclocked PCs and how much performance they can accomplish with water vs. fan cooled. Although in my opinion the lifecycle for a desktop of 6yrs is much longer than that of a laptop's 4yrs. I do as a PC builder have the tendency to upgrade parts every year or two may have extended the lifecycle a little longer than most, which is ultimately impossible for a laptop. Yes upgrading to more RAM and a larger HDD is possible, but one rarely replaces a laptop CPU. The real question should be does a mobile CPU really meet your performance for the applications you run and compare it to your own laptop's lifecycle? That's were you would see if it does make a difference.

4. Pedro
December 24, 2009 at 6:21 pm

my macbook pro ( no apple vs microsoft comments plz) heats up quite a bit, cpu is currently 63 degrees celcius and this is when im plugged in to the power without a battery, with a battery iÂ´ve reached up to 100 degrees celcius, in the article you mentioned 40 and 37 degrees, so im thinking i should get my computer checked, any ideas or comments?

• Dex
December 26, 2009 at 3:49 am

Sorry to tell you this, but your 100 degree temp in Celsius is possibly wrong, that's enough to boil water. You must mean 100 degrees Fahrenheit.
Yes, even that temperate is still quite hot for even a full size desktop. I don't know too much about Macs, but if possible you should see how much processor is being used and compare it to your temperatures at normal and higher operating loads. If your readings don't seem conceptual right, then yeah i would tell u to take it to the apple store to have it looked at.

• Pedro
December 26, 2009 at 10:42 am

thanks for the info, however, im using Â¨iStatÂ¨and it clearly indicates that its celcius, right now im using the battery and its 57 degrees, last night it was 99, and the piece of metal inbetween the keyboard and moniter was extremely hot, right now its just mildly warm, I will take it to a shop soon, I let my computer sleep overnight yesterday since i got worried,

however, my computer has been on almost 24/7 since i got it ( like 2 years )
I am starting to regret treating my laptop like a desktop, and need to look into options

5. JK III
December 24, 2009 at 12:36 pm

My cousin had recently bought a cooling pad and this was just the thing that came to my mind. Nice post.