The processor, or CPU, is the part of your computer that does the thinking. It runs your programs, handles multitasking and affects how quick everything feels. With so many models and brand names, choosing one can be confusing. This guide explains the specs that matter, how AMD and Intel compare in general, and how to match a processor to what you actually do.
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Key takeaways
- Match the CPU to the job: a mid-range chip is plenty for everyday use and most games.
- More cores and threads help with video editing, 3D work and heavy multitasking.
- Always check that the CPU socket and chipset match your motherboard.
- Compare current models in your budget rather than picking by brand.
Key CPU specs explained
Cores and threads
Cores are the processing units inside the chip. More cores help with multitasking and heavy workloads such as video editing, 3D rendering and running many apps at once. Threads let each core handle more than one task at a time. Everyday browsing and office work use few cores, while demanding creative work benefits from many.
Clock speed
Measured in gigahertz (GHz), clock speed shows how fast a core works. Higher speeds usually help single-task performance, including many games. Boost clocks show the maximum speed a CPU can reach briefly. Compare speeds only between similar generations, since newer designs do more work per cycle.
Cache
Cache is fast memory built into the processor. More cache can improve performance in certain games and workloads.
Integrated graphics
Some processors include basic graphics, which is enough for everyday use and video streaming. If you plan to game or do graphics-heavy work, you will want a separate graphics card, in which case integrated graphics may not matter.
Socket and chipset
The CPU must fit your motherboard’s socket and be supported by its chipset. This is one of the most common buying mistakes. Always check the motherboard’s compatibility list before purchasing.
Power and cooling
Higher-performance CPUs use more power and produce more heat. Some come with a cooler; others need a separately purchased one. Make sure your power supply and case can handle your choice.
AMD or Intel?
Both companies make excellent processors across every price range, and the best choice changes over time. Rather than picking by brand, compare current models in your budget for the tasks you do, and read recent reviews and benchmarks for those tasks. Also consider the platform: motherboards, memory type and upgrade paths vary between brands and generations. If you are leaning toward Intel, our guide to Intel Core i3, i5, i7 and i9 explains how to read the model names.
Choose a processor by what you do
- Office, browsing and streaming: an entry-level or mid-range chip is plenty.
- Gaming: a strong mid-range CPU paired with a good graphics card. The graphics card often matters more.
- Video editing, 3D and streaming while gaming: more cores and threads, plus enough memory.
- Small or quiet builds: efficient chips with lower power draw.
CPU buying checklist
- Decide what you will use the computer for.
- Set a budget for the whole system, not only the CPU.
- Check socket and chipset compatibility with your motherboard.
- Confirm whether a cooler is included.
- Check your power supply and case clearance.
- Read recent reviews for your use case.
Upgrading an existing PC
If you are replacing a processor in an existing computer, find your motherboard model first and check the manufacturer’s supported CPU list. A BIOS update may be needed for newer chips. When the socket is too old, a CPU upgrade usually means a new motherboard too, and possibly new memory.
Frequently asked questions
How many cores do I need?
Four to six cores suit everyday use and many games. Eight or more help with heavy creative or multitasking work.
Is a higher GHz always better?
Not always. Compare chips of the same generation, and consider cores and cache too.
Do I need a separate cooler?
Check the listing. Many mid-range CPUs include one, but high-end chips often do not.
Will a new CPU fit my old motherboard?
Only if the socket and chipset are supported. Always check compatibility first.
Is AMD or Intel better for gaming?
Both make strong gaming chips, and the lead changes by generation and price. Check recent reviews for the specific models in your budget.
What does a CPU do in a computer?
It runs the instructions that programs give it, so it affects how quickly apps open, how smoothly multitasking feels and how well the computer handles demanding tasks.
Related tech guides
- How to choose an Intel processor: Core i3, i5, i7 and i9 explained
- How to choose RAM: capacity, speed and compatibility
- How to choose an HP desktop computer
See more computer picks in our electronics guides.