Everyone has trouble choosing what kind of processor they need in their laptop while their purchase .It does not mean that i7 is the best and i3 is the waste ,but each has its wan way of use .
    For people who have more money to spend on a laptop and need more graphics ,smooth performance during heavy work because i5 and i7 processors have Turboboost technology which is used to power your processors while you are limited by ram while playing games .
    The people who does normal work like watching movies ,browsing, normal gaming ,editing stuff can choose i3 because it works for the purpose and is available for low cost .And for those who need everything in normal can choose i5.


-> Introduced in 2010.
-> It is a 64-bit µP.
-> It has 2 physical cores.
->  Its clock speed is from 2.93GHz to 3.33 GHz.
-> It has 781 million transistors.
->  It has 64 KB of L1 cache per core, 512 KB of L2 cache and 4           MB of L3 cache
-> Dual core CPU.
-> Hyper Threading.

INTEL CORE I5  :                                                                      
-> Introduced in 2009.                                                                     
-> It is a 64-bit µP.                                                                           
-> It has 4 physical cores.                                                                
-> Its clock speed is from 2.40 GHz to 3.60 GHz.                          
-> It has 781 million transistors                                                          -> It has 64 KB of L1 cache per core ,256 KB of L2 cache and              8MB of L3 cache  .
 -> It has Dual Core CPU and Hyper Threading.
-> TurboBoost (slightly higher clockspeeds than i3)


-> Introduced in 2008.
-> It is a 64-bit µP.
-> It has 4 physical cores.
-> Its clock speed is from 2.6 GHz to 3.33 GHz.
-> It has 781 million transistors.
-> It has 64 KB of L1 cache per core, 256 KB of L2
               cache and 8 MB of L3 cache
 -> It has Dual Core CPU for models ending with M. 
 -> It has Quad Core CPU for models ending with QM.
  -> Hyper Threading.
-> TurboBoost (slightly higher clockspeeds than i5)
-> Virtualization.
->  New Instruction set AE5.


Also called clock rate, the speed at which a microprocessor executes instructions. Every computer contains an internal clock that regulates the rate at which instructions are executed and synchronizes all the various computer components. The CPU requires a fixed number of clock ticks (or clock cycles) to execute each instruction. The faster the clock, the more instructions the CPU can execute per second.

Clock speeds are expressed in megahertz (MHz) or gigahertz (GHz).

CPU has clockspeed in all processors but remember a laptop is more reliable if it ha more clockspeed i.e., if a laptop has i5 processor with more clockspeed is better than a i7 processor with low clockspeed.


If you do decide to overclock, or you ever speak to someone who regularly overclocks processors, you’ll discover a dirty little secret – the clock speed a processor ships at is typically much lower than the actual maximum clock speed which the processor could achieve.

The extra headroom isn’t used only because the manufacturer (Intel or AMD) needs to plan for worst case scenarios, which means they need a processor which is sold as a 3GHz processor to work at that speed even if someone decides to use a winter jacket as a PC case.

At least, that is how processors used to be. However, Intel’s new Core i5 and Core i7 processors have a feature called Turbo Boost which has the ability to dynamically scale up the clock speed of a processor depending on the thermal headroom available
Intel Turbo Boost monitors the current usage of a Core i5 or i7 processor to determine how close the processor is to the maximum thermal design power, or TDP. The TDP is the maximum amount of power the processor is supposed to use. If the Core i5 or i7 processor sees that it is operating well within limits, Turbo Boost kicks in.

Turbo Boost is a dynamic feature. There is no set-in-stone speed which the Core i5 or i7 processor will reach when in Turbo Boost. Turbo Boost operates in 133Mhz increments and will scale up until it either reaches the maximum Turbo Boost allowed (which is determined by the model of processor) or the processor comes close to its maximum TDP. For example, the Core i5 750 has a base clock speed of 2.66GHz but has a maximum Turbo Boost speed of 3.2GHz.

However, Intel still advertises these processors by their base clock speed. This is because Intel does not guarantee that a processor will ever hit its maximum Turbo Boost speed. I have yet to hear of an Intel processor which can’t hit its maximum Turbo Boost speed, but hitting the maximum Turbo Boost is dependent on workload – it won’t happen all of the time.

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