what is a case computer

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What Is a Computer Case?

A case keeps the computer's internal components safe and cool

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The computer case serves mainly as a way to physically mount and contain all the actual components inside a computer, like the motherboard , hard drive , optical drive , floppy disk drive , etc. They typically come bundled with a power supply .

The housing of a laptop, netbook, or tablet is also considered a case, but since they aren't purchased separately or very replaceable, the computer case tends to refer to the one that's part of a traditional desktop PC.

Some popular computer case manufacturers include CORSAIR , NZXT , Xoxide , and Antec .

The computer case is also known as a tower , box, system unit, base unit, enclosure, housing , chassis , and cabinet .

Important Computer Case Facts

Motherboards, computer cases, and power supplies all come in different sizes called form factors. All three must be compatible to work properly together.

Many computer cases, especially ones made of metal, contain very sharp edges. Be very careful when working with an open case to avoid serious cuts.

When a computer repair person says "just bring the computer in," they are typically referring to the case and what's inside it, excluding any external keyboard, mouse, monitor, or other peripherals .

Why a Computer Case Is Important

There are several reasons why we use computer cases. One is for protection, which is easy to assume because it's the most obvious. Dust, animals, toys, liquids, etc. can all damage the internal parts of a computer if the hard shell of a computer case doesn't enclose them and keep them away from the outside environment.

Do you always want to be looking at the disc drive, hard drive, motherboard, cables, power supply, and everything else that makes up the computer? Probably not. Hand-in-hand with protection, a computer case also doubles as a way to hide all those parts of the computer that nobody really wants to see each time they look in that direction.

Another good reason to use a case is to keep the computer cool . Proper airflow over the internal components is one more benefit to using a computer case. While the case has special vents to allow some of the fan air to escape, the rest of it can be used to cool down the hardware , which would otherwise get pretty hot and possibly overheat to the point of malfunction.

Keeping noisy computer parts, like the fans, in a closed space within the computer case is one way to reduce the noise they make.

The structure of the computer case is also important. The different parts can fit together and become easily accessible to the user by being compacted in a case to hold it all together. For example, USB ports and the power button are easily accessible, and the disc drive can be opened at any time.

Computer Case Description

The computer case itself can be constructed from any material that still allows the internal devices to be supported. This is usually steel, plastic, or aluminum but might instead be wood, glass, or styrofoam.

Most computer cases are rectangular and black. Case modding is the term used to describe the styling of a case to personalize it with things like custom internal lighting, paint, or a liquid cooling system.

The front of the computer case contains a power button and sometimes a reset button. Small LED lights are also typical, representing the current power status, hard drive activity , and sometimes other internal processes. These buttons and lights connect directly to the motherboard, which is secured to the inside of the case.

Cases often contain multiple 5.25-inch and 3.5-inch expansion bays for optical drives, floppy disk drives, hard drives, and other media drives. These expansion bays are located at the front of the case so that, for example, the DVD drive can be easily reached by the user when in use.

At least one side of the case, perhaps both, slide or swing open to allow access to the internal components. See our guide on opening a computer case for instructions, or see what the inside of a PC looks like .

The rear of the computer case contains small openings to fit the connectors contained on the motherboard, which is mounted inside. The power supply is also mounted just inside the back of the case, and a large opening allows for the connection of the power cord and use of the built-in fan. Fans or other cooling devices may be attached to any and all sides of the case.

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What Is Computer Case?

A computer case also commonly referred to as a chassis, tower, system unit, enclosure or cabinet is essentially a shell that holds and protects all the vital components of a computer such as the motherboard, CPU, graphics card, memory, and other hardware parts.

The manufacture designed cases specifically to support, protect and store the internal components of a desktop computer ensuring their proper alignment, ventilation, and safeguarding against static due to computer on carpet and other potential external factors. 

Table of Contents

What Is Chassis In Computer Case?

The chassis in a computer is essentially the frame or body that holds all the internal components such as the motherboard, hard drives, and power supplies.

It acts as a protective cover that shields the internal components from external factors such as dust, debris, and moisture.

Moreover, the chassis also helps to dissipate the heat produced by the internal components through the use of fans and heatsinks if the thermal paste is proper applied. Thermal paste has a limited lifespan which can vary, so timely maintenance and replacement is crucial for optimal PC performance and longevity.

All of these factors play a crucial role in preventing hardware failures, reducing the risk of overheating, and ultimately prolonging the lifespan of a computer.

Therefore, the chassis not only serves as a structural component of a computer but also as a key factor in maintaining and protecting its internal components.

What Are The Functions Of Computer Case?

The primary function of a computer case is to protect and shield the critical computer hardware from external factors like dust, moisture, physical impact, electromagnetic interference, electrical interference and other forms of environmental hazards.

As computers generate a lot of heat, computer cases come with built-in fans or ventilation systems to ensure proper airflow and heat dissipation. It helps to prevent overheating, which can damage the system components, and ensures optimal performance and longevity.

Cable Management

Computer cases also play a vital role in proper cable management. They provide sufficient space and organization options for the cables, which helps to eliminate clutter, optimize and improve airflow and cooling, and make upgrades and maintenance more accessible.

Computer cases come in a range of designs and colors, which helps in the customization and aesthetics of your computer system. They are available in various shapes and sizes, including mid-tower, full-tower, and mini-tower, allowing the user to choose the one that suits their needs and preferences.

Aesthetics wise, you might want to consider investing in a transformer computer case with a unique design layout that sets it apart from other more common PC cases.

Noise Reduction

Many computer chassis come with thick, sound-dampening materials that help in reducing the overall noise generated by the system hardware components. It provides a quieter computing experience, especially for users working in shared environments like offices or homes.

What’s Inside the Pc Case? Computer Components

Inside the system unit, there are several computer components that work together to form the foundation of the computer’s processing power.

One of the primary components inside the system unit is the motherboard, which acts as the main circuit board that connects all the other computer components. The motherboard contains the CPU socket, RAM slots, and expansion slots for additional cards such as graphics or sound cards.

The CPU, or central processing unit, is the brain of the computer and is responsible for executing instructions and processing data. The CPU is typically mounted onto the motherboard and sits below a heat sink and rgb fans to keep it cool.

RAM, or random access memory, is the temporary storage that the computer uses to execute programs and store data while it is in use. The RAM slots are located on the motherboard, and the amount of RAM a computer has can affect its overall performance.

The hard drive is another critical component found inside the system unit. It is used to permanently store data and programs and is typically connected to the motherboard via a SATA cable. Cases comes with multiple internal drive bays that can be used for upgrading storage.

The power supply unit, or PSU, is responsible for providing power to all of the computer components inside the system unit. The Power supply is typically located at the back of the case and is connected to the motherboard and other computer hardware component with cables.

External bays are an integral part of computer cases that allow users to add or switch out various hardware components without opening up the case. These bays are located on the exterior of the computer case and can be accessed easily by the user.

Other hardware components can also be found inside the system unit, such as the graphics card, sound card, optical drives, and cooling fans. These computer components work together to ensure that the computer system unit functions correctly and provides the necessary power and performance for the user.

Computer Cases Form Factors : 

Form factors are the physical dimensions and layout of a computer case. Different form factors are designed to accommodate different types and sizes of motherboards, power supplies, and other internal components. Here are some common form factors of computer cases:

1. ATX (Advanced Technology eXtended) : This is the most common form factor for desktop computers. It measures 305mm x 244mm and provides space for up to seven expansion slots.

2. Micro-ATX: This smaller form factor measures 244mm x 244mm and is designed to fit in more compact cases. It typically has four expansion slots.

3. Mini-ITX: This is the smallest form factor and measures only 170mm x 170mm. It is designed for compact and low-power systems, such as home theater PCs.

4. E-ATX (Extended ATX): This larger form factor measures 305mm x 330mm and can accommodate up to nine expansion slots. It is designed for high-end gaming and workstation systems.

5. BTX (Balanced Technology eXtended): This form factor was developed by Intel as a replacement for ATX, but it never gained widespread adoption. It features a rotated motherboard, which improves air flow and reduces heat buildup.

Overall, choosing the right form factor for your computer case model is important in ensuring that all the components fit properly and that your system runs smoothly.

Types Of PC Cases 

The types of computer cases can be broadly categorized into two main groups: desktop computer cases and computer tower cases. Below are the key features and differences between the two types: 

1. Desktop computer cases are typically smaller and designed to sit flat on a desk. They are often used for home and office PCs and have limited expansion options. They are also typically less expensive than tower cases.

2. Tower computer cases are larger and designed to stand upright on the floor. They are used for more high-end and advanced systems and offer greater customization and expansion options. They generally offer more space for additional computer components, such as larger power supplies, multiple hard drives, and multiple expansion cards.

3. Tower cases can be further classified into mid-tower and full-tower cases. Mid tower cases are smaller and more affordable, while full-tower cases are larger and offer even more expansion possibilities. 

4. Some other types of computer cases include cube cases, SFF (small form factor) cases, and HTPC (home theater PC) cases. Cube cases are smaller versions of tower cases with a cube-shaped design. SFF cases are even smaller, designed to be compact and portable. HTPC cases are designed specifically for media center PCs and often resemble AV equipment.

5. The material used for construction are also different. Some computer cases are made of plastic, while others are made of aluminum or steel. Each material has its own unique advantages and disadvantages.

In addition to the above points, it’s important to bear in mind that the choice of computer case will depend on personal preferences, intended use, and budget.

How has the design of computer cases evolved over the years?

Computer chassis have undergone numerous transformations both in terms of design and functionality.

Initially, they were bulky and served only as a protection for the internal components. Today, modern computers sleek designs with tempered glass, LED lighting, and better ventilation add to the aesthetics of the computer’s overall look.

With the evolution of technology, computer cases have also become more efficient, allowing for better cooling systems and faster processing speeds.

In short, computer cases manufacturers have come a long way from simple boxes to stylish and functional works of art.

Some popular computer brands have started implementing dust filter systems in their products, such as Corsair, Cooler Master, and Fractal Design.

With vast knowledge and research on how dust accumulates and affects the longevity of PC components, some of these brands now make it easy for users to clean and replace their filters regularly.

So, what is a PC case? A computer case is more than just a protective housing. It is an essential component that performs critical functions like cooling, proper cable management, noise reduction, and customization, among others. Choosing the right computer case is crucial to ensuring the optimal performance and longevity of your computer system.

In the context of computer components, “case” stands for “Computer Aided Software Engineering”. However, when referring to the physical enclosure that houses the PC components, “case” stands for “computer case”.

The most important characteristic of a computer case is its ability to protect the computer’s components from external damage, dust, and other harmful elements. This ensures the safe operation of the computer and prolongs its lifespan. Additionally, a good computer case should have adequate ventilation and cooling to prevent overheating, and enough space to accommodate all the necessary hardware components.

I am a PC enthusiast with a passion for gaming and all things tech. With years of experience building and customizing PCs, I have become a go-to source for PC case reviews and gaming insights. I am dedicated to researching and writing about the latest trends and developments in the PC gaming industry, with a particular focus on PC cases. From budget-friendly options to high-end builds, I have the expertise to guide you through the process of selecting the perfect case for your needs. Whether you’re a beginner or a seasoned pro, my in-depth reviews and practical tips will help you make an informed decision.

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How to buy the perfect PC case

No matter whether you treat your computer as the centerpiece of your home office or just stuff it under your desk, buying the right PC case matters .

At a minimum, you want to pick a PC case that’s the right size for your needs and has room for all your hardware and USB devices. But some PC cases offer much, much more. Spacious innards, lower temperatures, muffled sound, extensive water-cooling support, and fancy-schmancy tempered glass panels or RGB lighting are just the tip of the iceberg.

Here’s a guide to buying a PC case that’s perfect for you . This is just the first step in your DIY journey; be sure to check out PCWorld’s guide to building a PC , too, as well as our guide on setting up your PC’s fans for maximum system cooling .

Editor’s note: Last updated with our latest videos in the PC case news section, update information throughout, and changes to our recommended cases.

PC case news

Last year, pricing for cases have steadily slipped upwards in the wake of the United States’ tariffs on Chinese products, followed by high demand for computer parts during the global pandemic. While stock has stabilized since, prices on most cases continue to be higher on average.

Remember to check out our case tear-downs on PCWorld’s YouTube channel , such as on the Lian Li 011 Air Mini and Azza Pyramid case.

Size matters for PC cases

Before anything else, decide what size case you need. There are three major case sizes: Full tower, mid-tower, and mini-ITX.

Full-tower and mid-tower cases both fit standard ATX motherboards—by far the most common motherboard size out there. Both can also fit smaller micro-ATX motherboards. Exact sizing varies from case to case, but most mid-towers run up to roughly 18 inches high and 8 or so inches wide. Mid-tower PCs are probably the most common form factor and have enough room to fit systems with a closed-loop CPU cooler, a couple of graphics cards, and a lot of storage.

Lian Li O11 Dynamic Mini next to the towering Caselabs SMA-8a .

Full-tower cases are massive . They often measure more than 20 inches in height and are longer and deeper than mid-tower cases, which makes them ideal if you’re one of the rare people using a massive Extended-ATX motherboard. 

Also consider a full-tower case if you plan on loading up your rig with extensive (or custom) water-cooling, storage galore, or 3- and 4-way graphics card setups. Full-tower cases often support more fans and 5.25-inch drive bays as well. And the extra elbow room sure is nice during building.

Mini-ITX cases are the polar opposite of full-tower PC cases, built for diminutive mini-ITX motherboards . Some of these can be wondrously small and even fit inside home theater cabinets, but the tight quarters can create compatibility issues with some hardware. Don’t expect to use liquid-cooling or a big honking CPU cooler in most mini-ITX cases. Some mini-ITX cases don’t support full-length graphics cards, either; confirm the maximum length before you buy. Finally, there isn’t much room for extra hardware in these space-constrained chassis, so you’ll be limited to fairly basic system configurations. They’re great for schlepping to LAN parties, though!

Sometimes you’ll see “mini-tower” cases, which slot between mini-ITX and mid-tower in size to accommodate micro-ATX motherboards. They’re rarer than the others.

Price considerations for PC cases

Once you’ve decided how big of a PC case you need, the next step is figuring out your budget.

If you’re spending $50 or less, you’re probably going to wind up with a bare-bones, nondescript case with few extra features. Try to pick one that has two fans, one in the front of the case and another in the rear, for maximized air-flow, which helps cooling. You won’t always find the option in this price range, though.

Things open up in the $50 to $150-ish price range, which has seen a lot of advancement over the past few years. You’ll find a lot of variance in both design and construction in the midrange. As always, be sure to check measurements to ensure your desired PC case can fit all your hardware, and you’ll also want to keep an eye on extra features. They’re a lot more common in this price range, especially as you move up in cost.

Features purely come down to personal preference or specifics needed for your build. Some cases are built with more fans for higher performance; others focus on silent design. Some—most notably much of Corsair’s case lineup—even eliminate 5.25-inch drive bays completely for better airflow. You’ll start to find water-cooling compatibility worked into some cases in this price range, along with better cable management details, tool-less design, and aesthetic niceties like RGB lighting or tempered-glass side panels. We’ll get into feature details shortly, but around $100 is the sweet spot for price-to-performance when it comes to buying a PC case.

Once you extend beyond $150 or so, you should expect a PC case that excels in both performance and acoustics, and one that comes with connectivity options and handy features galore. Some of them are huge ; this is where you’ll find most full-tower cases. Build materials tend to be swankier in high-end cases, with aluminum and tempered glass being much more common than in budget and mid-range cases.

You’ll also find wild concept cases like the motorized, sadly discontinued In Win H-Tower, which opens like a flower. Caselabs are now bankrupt, but their cases remain legendary. And don’t forget cases (if we can call them that!) like the Lian Li DK-04F desk. 

Be mindful when you’re buying a PC case that doubles as a funky flagship, though. They oftentimes sacrifice functionality for their exotic forms.

PC case aesthetics 

Make sure you like the look of the PC case you’re buying! You’re going to be staring at it for years to come, so this is not a superficial consideration. Every online retailer shows PC cases from multiple angles on their store pages, so there’s no excuse for buying ugly.

PC cases come in all sorts of colors, materials, and designs. If you don’t want to spend time neatening up your interior cabling, pass on cases with a side window.

This case has a side window but I took off its whole side panel for this picture.

Buy a PC case: Features to watch for

Aside from the basic dimensions and price, feature support is the biggest differentiator when you’re buying a PC case. The more you spend on your case, the more goodies you’ll receive. Here’s a quick rundown of many of the features you’ll find in modern PC cases, starting with practical extras before delving into nice-to-haves.

Drive bays and SSD mounting points: With recent trends towards using NVMe SSDs , room for large physical drives are less necessary with modern cases. Many people still use traditional SATA-based SSDs or hard drives, though. If that’s part of your build, make sure a PC case has enough 2.5-inch and 3.5-inch drive bays to house your storage drives. Some cases include mounting points for SSD on the rear of the motherboard tray, too. And if you need a 5.25-inch bay in the front of your PC to house an optical drive, fan controller, or whatever, confirm your case includes that. A number of cases have been ditching 5.25-inch bays to improve airflow from the front-side fan(s)—most notably several Corsair cases.

Some cases come with tool-less brackets that make mounting hard drives really easy.

Tool-less design: In ye olden days, practically everything in a PC case required a Phillips screwdriver. No more. Tool-less design is nearly universal in mid-range and high-end cases, with thumb screws for internal fastening and twist-on, snap-on, or otherwise tool-free mechanisms in drive bays.

Cable management : Look for a case with cut-outs in the motherboard tray, which allow you to route your cabling through the rear of your case. Out of sight, out of mind. Budget PC cases tend to have simple giant holes punched in the motherboard tray, while mid-range options frequently include rubber grommets in the holes to tidy things up even more. Some cases include tie-off points or even wire covers behind the motherboard tray to keep your cabling clean.

CPU cooler cut-away: Speaking of the motherboard tray, some nicer PC cases include large cut-outs in the section behind your processor, which let you replace your PC’s CPU or CPU cooler without ripping out your entire motherboard. It’s not a feature you’re likely to need often, but if you do , it’s a godsend.

Front-panel connectivity: If you’ve got a lot of external devices, check out the front-panel connectivity of the PC case. Even cheap cases have a couple of USB-A Type 2.0 ports in the front. Many modern cases include USB-A Type 3, USB-C, and even fan or RGB lighting controllers as table stakes. You’ll often find front-panel audio jacks as well, though we’d always recommend plugging your headset directly into the audio jack on your motherboard’s rear I/O shield.

High-end cases (like this Phanteks Enthoo Elite ) offer much more advanced front-panel connectivity.

Fans and airflow: The more fans you have in your PC, the better your airflow is likely to be. At the very least, you want two fans for optimal airflow—an intake in the front and an outward-blowing fan in the rear. Some budget PC cases include only a single fan, and your PC’s temperatures and performance will suffer for it. Even if they aren’t populated, many cases include additional fan mounts that allow you to upgrade your cooling later. As mentioned before, some cases are ditching 5.25-inch drive bays to remove airflow obstructions for the front fans, though you obviously wouldn’t want a case like that if you needed one of those bays.

Also pay attention to what’s in front of those fans. Tempered glass and stoic metal front panels are all the rage these days, but those pretty designs can hinder airflow if they’re not designed properly. The Silverstone RL06 ($110 on Amazon ) and Fractal Design Meshify C ($90 on Amazon ) skips those obstructions, placing protective mesh in front of several 120mm intake fans for superb airflow and thus, lower system temperatures than its rivals.

Dust filters: Keeping your PC clean is important. A computer clogged with dust and pet hair and tobacco gunk is a computer that runs hot and throttles more often. Dust filters keep most of that debris from ever reaching your fans, much less your precious internal hardware. But be sure to configure your fans for positive air pressure to keep dust from being sucked in through the unoccupied vents in your chassis.

Sound-dampening: Soundproof cases keep your rig running quiet, often by using sound-dampening materials inside the panels of your PC. Those materials keep noise in but also tend to impede airflow, so soundproof cases often hit somewhat higher temperatures than standard cases. Some nicer soundproof cases manage to stay silent while also optimizing for airflow by including large 140mm fans spinning at low (and hence quiet) speeds.

Water-cooling support: The rise of sealed all-in-one coolers have made liquid-cooling more popular than ever. If you plan to water-cool your PC, pay fine attention to the support provided by your case. You probably won’t be able to use liquid-cooling whatsoever in most mini-ITX cases, and many mid-tower cases only support up to 240mm radiators—and placement of that liquid-cooling radiator may be limited to only the top or bottom of the case, depending on the case’s dimensions.

If you want a beefy 360mm radiator, you’ll often need to step up to a full tower case, though unusually large mid-towers can sometimes squeeze them in as well. Some pricier cases also have large swatches of interior space dedicated to liquid-cooling reservoirs for custom loops.

Tempered-glass panels: Many newer PC cases include panels consisting entirely of tempered glass, presenting an unfettered look at your PC’s inner hardware, albeit at the cost of air flow. It’s gorgeous, but brittle—handle with care! You’ll start to find tempered-glass options around the $70 range, though they’re more common around $100.

Let there be light. Or not. It’s up to you!

Integrated lighting: Customizable RGB lighting is a big craze in recent years, and that includes PC cases. You either love RGB or you hate RGB . Either way, it’s easy to find cases that meet your aesthetic tastes. You can even watch us build an RGB PC —that was fun!

Vertical GPU mount : Many cases now include the option to have a vertical GPU mount that displays your graphics card. Do note that you may need a special bracket that can vary by case, and a high-quality PCIe riser cable. Some PCIe 4.0 graphics cards will require appropriate cables to work with the newest GPUs as well.

Our favorite PC cases

We don’t do many formal PC case reviews at PCWorld, but we’re constantly building PCs in all sorts of rigs. Here are some of our favorites in each price point. (Note that the U.S. tariffs on Chinese products have resulted in price increases of about $10 to $25 per case.)

Best budget PC cases

• Corsair 4000D Airflow : Coming in at under $100, this is a very well-rounded case. It looks great aesthetically, while offering good cooling performance. You can also swap out the front panel with glass if desired.
• Lian Li Lancool II Mesh : As an alternative, this also provides fantastic airflow with an attractive design.

• Cooler Master NR200P : Mini-ITX? Check. Great airflow? Check. Flexible build options? Check. Great price? Yep! One of the best mini-ITX cases you can buy.

Best mid-range PC cases

• Lian Li 011 Dynamic : The fan favorite. Beautiful aesthetics, flexible hardware support, and only $150.
• Be quiet! Silent Base 601 : Quiet performance, refined build quality, understated aesthetics. It also comes with excellent Pure Wing 2 fans.

The Maingear Vybe.

• Maingear Vybe : Want an affordable mid-tower that has water cooling in mind? This case is built for that, with an RGB controller and smart Apex distribution plate mounting.

Best high-end PC cases

• Lian Li 011 Dynamic XL Remove non-product link : Larger than its younger sibling, the XL version of the 011 has tons of room for the most insane hardware setups—and it looks great.

The Fractal Design Define 7 XL.

• Fractal Design Define 7 XL : Big and filled to the brim with options that will make any PC builder smile. Also check out Fractal’s Meshify series if you’d like more airflow.
• Lian Li DK-04F : Yep, it’s a desk which doubles as a PC! There’s an even larger version that can fit two motherboards, the DK-05. Features include automatic height adjustment, opaque glass that reveals your hardware at the touch of a button, and, you know, the fact that’s it’s both a desk and PC case . Very expensive but very unique.