CPU buying guide that's help you!!!

Whenever you are upgrading your existing system or building a new PC, the CPU matters a lot. Increased clock speeds and core counts can make a huge difference in overall performance, providing a more responsive system, smoother gameplay and faster turnaround on intensive tasks such as video transcoding or editing. Plus, the chip you choose will also dictate your motherboard options, as each CPU only works with a specific CPU socket and set of chipsets.

You can not lose with AMD or Intel:

For mainstream users, so long as you are considering current-generation parts, this debate is basically a wash, with Intel doing a bit better on 1080p gaming and browsing and AMD handling tasks like video editing faster.

Clock speed is more important than core number:

Higher clock speeds translate to snappier performance in simple, common tasks such as gaming, while more cores will help you get through time-consuming workloads faster.

Get the latest generation:

You won't save much money in the long run by going with an older, previous-generation chip.

Budget for a full system: 

Don't  pair a strong CPU with weak storage, RAM and graphics.

Overclocking isn't for everyone: For most people, it makes more sense to spend that extra cash on buying a higher-end chip.

What are the key CPU specs and which should I care about?

If you're looking at a spec sheet for a given CPU, you'll see a lot of numbers. Here's what to look out for.

Clock speeds: Measured in gigahertz (GHz), this is the speed at which the chip operates, so higher is faster. Most modern CPUs adjust their clock speeds up or down based on the task and their temperature, so you'll see a base (minimum) clock speed and a turbo (maximum) speed listed.

1.Cores: These are the processors within the processor. Modern CPUs have between two and 32 cores, with most processors containing four to eight. Each one is capable of handling its own tasks. Unless you're a bargain-hunter, you want at least four cores.

2.Threads:This is the number of independent processes a chip can handle at once, which in theory would be the same as the number of cores. However, many processors have multithreading capability, which allows a single core to create two threads. Intel calls this Hyper-Threading and AMD calls it SMT (Simultaneous Multithreading). More threads mean better multitasking and enhanced performance on heavily-threaded apps such as video editors and transcoders.

3.TDP: The Thermal Design Profile/Power (TDP) is the maximum amount of heat that a chip generates (at stock speeds), as measured in watts. By knowing that--for example--the Intel Core i7-8700K has a TDP of 95 watts, you can make sure you have a CPU cooler that can handle that amount of heat dissipation and also that your PSU can provide enough juice. But note that CPUs put out significantly more heat when overclocked. It's good to know what your TDP is so you can get the right cooling and power equipment to support your CPU. Also, a higher TDP usually coincides with faster performance.

4.Cache: A processor's onboard cache is used to speed up access to data and instructions between your CPU and RAM. There are three types of cache: L1 is the fastest, but cramped, L2 is roomier but slower, and L3 is spacious but comparatively sluggish. When the data a CPU need isn't available in any of these places, it reaches for the RAM, which is much slower--in part because it's physically farther away than a CPU's on-chip cache.You shouldn't pay too much attention to cache size, because it's hard to equate to real-world performance, and there are more important factors to consider.

5.IPC: Even if you have two CPUs that have the same clock speed and number of threads, if they're from different companies, or built on different architectures from the same company, they will produce different numbers of IPC (instructions per clock cycle). IPC is heavily dependent on the CPU's architecture, so chips from newer generations (ex: a 9th Gen Core i7 versus an 8th Gen Core i7) will be better than older ones.

IPC is not usually listed as a spec and is usually measured through benchmark testing, so the best way to learn about it is to read reviews.