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Not everyone wants a big tower under the desk. If you need a PC for the family, the office, a kitchen counter or a small apartment, the choice often comes down to two compact designs: an all-in-one PC, where the computer is built into the screen, and a mini PC, a small box that connects to a monitor you choose. They solve the same problem in different ways, and the differences affect price, upgradability, repair, performance and how tidy your desk looks.
This guide compares all-in-one and mini PCs on design, display, performance, upgrades, ports, noise, cost, warranty and typical uses, and gives a checklist for choosing and buying either one. It is based on general PC knowledge rather than testing of specific products. Always check the specifications of the exact model, since compact PCs vary widely in what can be upgraded.
Last updated: November 1, 2026.
What Each One Is
All-in-one PC
An all-in-one combines the screen and the computer in one unit. The processor, memory, storage and often speakers, webcam and microphone are built into the housing behind the display. You plug in power, and add a keyboard and mouse, which often come in the box. The result is a tidy desk with very few cables.
Mini PC
A mini PC is a small computer box, often smaller than a book. It has ports for monitors, USB devices and network, but no screen. You connect your own monitor, keyboard and mouse. Some mini PCs can be mounted behind a monitor using a bracket, which makes them nearly invisible.
For comparison: tower PC
A tower is a full-size case with room for large graphics cards, multiple drives and easy upgrades. It offers the most performance and upgrade options but takes the most space. For heavy gaming, a tower or a gaming laptop is usually the better answer than either compact type. See our small form factor PC list for compact desktops that sit between a mini PC and a tower.
Side-by-Side Comparison
| Feature | All-in-one | Mini PC |
|---|---|---|
| Screen | Built in; fixed size | Not included; use any monitor |
| Cables on the desk | Very few | Power, display, keyboard and mouse cables |
| Space | One footprint | Tiny box plus a monitor |
| Upgrade options | Limited; often RAM and storage only, sometimes neither | Often RAM and storage; screen can be upgraded separately |
| Repair | Harder; screen and computer are tied together | Easier; replace the box or the monitor on its own |
| Cost for a given performance | Higher, because you pay for the screen too | Often lower if you already own a monitor |
| Performance range | Everyday to mid-range; a few with graphics | Basic to powerful, including models with strong integrated graphics |
| Touchscreen | Common option | Depends on the monitor |
| Speakers and webcam | Usually built in | Usually not; need external ones |
| Best for | Simplicity, shared family use, tidy desks | Flexibility, reuse of a monitor, small spaces |
The Display
This is the biggest difference.
All-in-ones have a fixed screen, typically from about 21 to 32 inches. Quality varies. Many use ordinary full HD panels, and higher-end models offer sharper resolutions or touch. The screen is the part most likely to date as technology moves on, yet you cannot swap it. Check brightness, resolution and viewing angles. Our monitor size and resolution guide explains what size and sharpness suit your desk.
A mini PC lets you pick the display that suits you, whether a basic office monitor, a gaming monitor or a TV. You can upgrade the monitor and the computer independently. If you already own a good monitor, the mini PC is a cheap way to refresh your computer. Check that the mini PC has the right video outputs for your screen, and that it supports the resolution and refresh rate you need.
Performance
Both types use laptop-class or efficient desktop processors, which keeps size and power down.
- Everyday use: web browsing, documents, video calls, streaming video and light photo editing run well on modest all-in-ones and mini PCs, as long as they have enough memory and a solid state drive.
- Light gaming: newer processors with strong integrated graphics can play older and lighter games at modest settings. Some mini PCs focus on this and perform well for their size.
- Heavy gaming and creative work: compact designs with limited cooling and no dedicated graphics card fall short. For that, choose a tower or a gaming laptop.
Check the processor generation, not just the name. A recent mid-range chip can outperform an older high-end one. Look for 16 GB of memory if you can, and a solid state drive. Our DDR4 vs DDR5 guide explains memory types.
Upgrades and Longevity
This is where mini PCs usually win.
- Mini PCs. Many allow replacing the memory and the solid state drive. Some have a second storage slot. A few have soldered memory, so check before you buy.
- All-in-ones. Many have limited access. Some allow RAM or storage upgrades through a panel, but others require disassembly or have soldered parts. Processors and graphics are rarely upgradable.
Before buying, look up the exact model’s service manual or upgrade information. If RAM is soldered and the model has only 8 GB, you are stuck with 8 GB for life. Our PC storage upgrade guide shows how storage upgrades work where they are possible.
Ports and Connectivity
Compare the ports with your needs.
- USB-A and USB-C ports for peripherals and drives.
- Video outputs. Mini PCs often have two or more, which supports multiple monitors. See our dual monitor setup guide.
- Ethernet, ideally gigabit or faster, plus WiFi and Bluetooth.
- A card reader, headphone jack and other extras on some all-in-ones.
- Front-facing ports. Mini PCs often have them, which is convenient. All-in-ones may put ports on the back or the side.
An all-in-one with ports hard to reach behind a fixed screen can be annoying. A mini PC tucked behind a monitor can have the same issue.
Noise, Heat and Power
- Cooling. Compact designs have small fans, which can get loud under load. Low-power processors run cooler and quieter. Check reviews for noise.
- Heat. Mini PCs get warm when stacked or enclosed. Leave room for airflow. All-in-ones can get warm behind the screen.
- Power use. Both are efficient compared with a tower, which suits PCs that run all day.
- Dust. Small fans clog easily. Clean vents occasionally. See our overheating guide for cleaning and airflow tips.
Cost: Think in Complete Setups
Compare the total cost of a working setup.
| Item | All-in-one | Mini PC |
|---|---|---|
| Computer | Included | Purchased |
| Screen | Included | Purchased or reused |
| Keyboard and mouse | Often included | Usually extra |
| Speakers and webcam | Often included | Extra if needed |
| Cables and mounting | Minimal | Cables, maybe a mount |
If you already own a screen, keyboard and mouse, a mini PC can be considerably cheaper. If you are starting from nothing, the gap narrows and the all-in-one’s convenience may be worth it.
Warranty and Repair
A fault in an all-in-one can affect the whole machine. A cracked screen or a failed motherboard may mean sending the whole unit away. With a mini PC and monitor, a failure in one does not take the other down, and replacing a part is cheaper. Check warranty length and what it covers. Business-class models often have longer support options.
Who Should Choose Which
| Your situation | Better choice | Why |
|---|---|---|
| Family computer in a shared room | All-in-one | Simple, tidy, includes screen and speakers |
| Home office with a good monitor already | Mini PC | Reuses your monitor and costs less |
| Small apartment or limited desk space | Either; mini PC for the least footprint | Compact options |
| Reception desk or kiosk | All-in-one with touch | Clean look and easy use |
| Media center connected to a TV | Mini PC | Small and hidden |
| Student with a tight budget | Mini PC with a basic monitor | Lowest total cost |
| Wanting to upgrade over the years | Mini PC or tower | Better upgrade options |
| Heavy gaming or video editing | Tower or gaming laptop | Neither compact type is ideal |
What to Check Before You Buy
- Processor generation and performance level for your tasks.
- Memory: 16 GB if possible, and whether it is upgradable.
- Storage: a solid state drive with enough capacity, and whether you can add more.
- Display (all-in-one): size, resolution, brightness, touch.
- Video outputs (mini PC): the right ports for your monitor and count of displays.
- Networking: WiFi standard, Ethernet speed and Bluetooth.
- Ports in useful positions.
- Noise and cooling from reviews.
- Operating system and license: included or not.
- Warranty and support options.
If you are not sure about your current setup and what you need, see our guide to checking PC specs. Our all-in-one PC list compares models, and our 32-inch monitor list may help if you pair a mini PC with a large screen.
New, Refurbished or Used?
Business-class mini PCs and all-in-ones are commonly sold refurbished at low prices. They can be good value for basic tasks, but check the processor generation, storage type, battery of the real-time clock, warranty and the seller’s reputation. Be careful with very old models that may not support current Windows versions. New models come with warranty and the latest features.
Common Mistakes
- Buying an all-in-one and later wishing you could swap the screen.
- Choosing a model with soldered 8 GB RAM and no upgrade path.
- Forgetting to budget for a monitor, keyboard and mouse with a mini PC.
- Buying a mini PC without the right video ports.
- Expecting heavy gaming from integrated graphics.
- Putting a mini PC in an enclosed space with no airflow.
- Buying a very old refurbished unit with no support.
- Ignoring noise in a quiet room.
Frequently Asked Questions
Is a mini PC better than an all-in-one?
It depends. Mini PCs are more flexible and upgradable, and often cheaper. All-in-ones are simpler and tidier.
Can I upgrade an all-in-one PC?
Some allow RAM or storage upgrades, many do not. Check the specific model’s service information.
Can a mini PC play games?
Light and older games, yes, especially with strong integrated graphics. Heavy modern games need more power.
Do I need a monitor with a mini PC?
Yes. A mini PC has no screen. You can use a monitor or a TV.
Are all-in-one PCs good for work?
Yes, for office tasks and calls, especially with a decent screen, webcam and microphone.
How much RAM do I need?
16 GB is a comfortable baseline for everyday use. 8 GB can be limiting.
Can I mount a mini PC behind a monitor?
Many support a VESA mounting bracket. Check the model and your monitor.
Which lasts longer?
A mini PC paired with a separate monitor lets you replace parts independently, which often makes the setup last longer.
Bottom Line
Choose an all-in-one when you want a simple, tidy, ready-to-use computer and you will not need to upgrade it. Choose a mini PC when you already have a monitor, want a smaller footprint, a lower total price or the ability to upgrade memory and storage. Whichever you choose, aim for a recent processor, 16 GB of memory and a solid state drive, check ports and upgrade options before buying, and pick a tower or gaming laptop if your main goal is heavy gaming.
