The answer to this question really depends on your regular computing tasks. Higher clocks translate to quicker responsiveness and program load times (though RAM and storage speed is key here as well). Higher clock speeds also mean single-threaded tasks (like audio editing and certain older applications) can happen faster. Many popular games are still lightly threaded.
But many modern programs can take advantage of lots of cores and threads. If you do lots of multitasking or edit high-res videos, or do other complex, time-consuming CPU-heavy tasks, you should prioritize the number of cores. But for the vast majority of gamers and general-purpose computer users, a clock speed ranging from 3-4GHz with four to eight cores is plenty.
What socket does my motherboard need for this CPU?
Different processors require different socket types. If you already own a motherboard and don't want to replace it, you'll need to purchase a CPU that matches your board's socket. Alternatively, you need to make sure that the motherboard you buy is compatible with your new processor.
With its current-generation Ryzen and Athlon parts (barring Threadripper), AMD has adopted a single socket—AM4—and pledged support for that socket until 2020. That means you should, with a BIOS update, be able to put a first-generation Ryzen chip into second-generation (and probably third-generation) Ryzen motherboard, and vice versa.
Intel, on the other hand, has a tendency in recent years not to support backward compatibility with its new chips and older motherboards, even if the socket is effectively the same. For instance, Intel’s socket LGA 1150 and 1151 differ by a single pin, and the version of 1551 designed specifically for 8th Generation Core chips is physically the same as that made for previous 6th and 7th Generation Core processors. But those older 1151-socket motherboards don’t work with newer 1151-socket CPUs, because (Intel says) the newer chips (which have more cores) have different power delivery subsystem needs.
This complexity is both frustrating from a future upgrade standpoint, and it means you have to buy a newer, more-expensive motherboard for a current-gen chip, even if a more-affordable previous-generation board has all the features you want. Here's a list of all the current sockets and their respective chipsets for reference.
When choosing a CPU, first ask what you're going to do with it, then see how much you can budget for it after you've figured out how much you're spending on other components like your SSD, RAM, GPU and PSU. While processors are important, there's no point in pairing a high-speed chip with weak graphics (unless you aren’t a gamer) or a slow, spinning mechanical hard drive. While reading about specs like clock speed and thread count is helpful, the best measure of a processor's performance comes from objective reviews.
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