Computer processor (CPU) buying tips
Purchasing a processor is an important consideration when building or buying a computer. Below are considerations and additional information about what to ask about and look for when purchasing a processor.
CPU manufacturer
The processor is an important consideration for users who are building a computer. Today, there are three desktop processor manufacturers: AMD, Cyrix, and Intel. Each of these companies has good and bad reviews, and each is close in compatibility and reliability. When deciding on the CPU manufacturer, ensure the motherboard you're using or plan on using is compatible. For example, if an Intel motherboard is purchased or currently installed, purchase a compatible Intel processor; if it's an AMD motherboard, purchase a compatible AMD processor.
Clock speed
The clock speed of the processor is an important consideration as it's one of the factors that determines the computer's overall speed. When looking at the speed of processors available, we highly recommend not purchasing the most recently released processor. The latest CPU is always going to be the most expensive option, and if you give recently released processors 2-4 months, its price will significantly drop.
A higher clock speed doesn't always mean that the processor is faster than another processor with a lower clock speed. Although it helps, other factors like the number of cores, amount of cache, and unique technologies can also affect overall speed. To get a true comparison of the speed of different processors, look for CPU benchmarking information.
Number of cores
For the most recent computer processors, the number of cores it has is another factor to consider when comparing processors. Computer games and programs that utilize multiple cores when processing information can make the CPU faster. For example, a processor with six cores will not perform as well as a processor with 16 cores.
Amount of cache
Cache is a memory that's on or near the CPU and is the fastest memory in the computer. When comparing CPUs realize that there are different levels of cache (L2 and L3) and that each processor may have different amounts of cache.
Motherboard
The motherboard and chipset compatibility is also important when deciding on the CPU. Not all motherboards or motherboard chipsets support all processors. If you've decided on the CPU, ensure the motherboard is compatible and has the CPU socket or slot required.
Not all AMD motherboards are compatible with all AMD processors, and not all Intel motherboards are compatible with all Intel processors. It's important to verify with the motherboard documentation that it supports the processor you plan on purchasing.
Cooling and heat sink
All processors require cooling either with an active or passive heat sink or with liquid cooling. The heat sink keeps the processor from overheating, and therefore, runs more efficiently. After purchasing a CPU, look for a compatible heat sink that works with the CPU, motherboard, and chassis you planning to use.
When purchasing the CPU, it's important to realize that it may not include a heat sink. If your CPU doesn't include a heat sink, it must be purchased separately.
If the CPU did come with a heat sink, realize that it can be substituted for any other compatible heat sink or cooling solution.
Other CPU considerations and terms
We've covered the most recent considerations when buying a CPU today. However, as processors have evolved and developed, other technologies and terms were used that are not covered on this page. If there's a confusing term you need further help with, search our site or visit the following link, which lists hundreds of CPU related terms.
Where can I buy a computer CPU?
Below are affiliate links with Amazon to get a computer CPU, related hardware, and support Computer Hope. If Amazon isn't available in your area, we also have a link to other places to buy computer parts.
- Amazon affiliate link for computer processors.
- Amazon affiliate link for CPU heat sinks.
- Amazon affiliate link for CPU thermal paste.
- Where to buy computer hardware parts.
CPU installation
Additional help and information about installing a computer processor and other hardware is on our How to install computer hardware.