A451 – Differences in Intel Cores i3, i5 and i7

Intel has three main cores, i3, i5 and i7. But what exactly are the differences. This post will be looking at each processor and listing what is so special about each of them.

Simply put, i7 is better than i5 and i5 is better than i3. However, Core i7 doesn’t have 7 cores and Core i3 doesn’t have 3 cores. The numbers simply represent their processing power.


Their levels of processing power are based on criteria involving the number of cores, clock speed (in GHz), size of cache, as well as Intel technologies like such as Turbo Boost.

The more cores there are, the more tasks can be done at a time. The lowest number of cores can be found in Core i3 CPUs, which have only two cores. All Core i3’s have two cores, these are called duel processors.

All Core i5 processors have four cores, these are called quad cores. All Core i7 are also quad core.

er_photo_181072Intel Core i3

Turbo Boost

Turbo Boost is Intel’s marketing name for the technology that lets a processor increase its core clock speed.The maximum amount that Turbo Boost can raise clock speed depends on the number of cores, the estimated current consumption, the estimated power consumption, and the processor temperature.

Core i3 processors don’t have Turbo Boost, however Core i5 and i7 do. Core i3 processors tend to have a higher base clock speed.

If a processor model ends with a K, it means it is unlocked and can be ‘overclocked’. This means you can force the CPU to run at a higher speed than its base speed all the time for better performance, the only downside is that is requires more power.

Image_03bIntel Core i5

Cache Size

When a CPU finds it is using the same data over and over, it stores that data in its cache. Cache is even faster than RAM, because it’s part of the processor itself. Core i3 chips have 3-4MB, while i5s have 6MB and the Core i7s have 8MB.

425056-intel-core-i7Intel Core i7

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