What is a Processor?

The Processor or Central Processing Unit (CPU) component of your PC that carries out instructions given to it by your Operating System (Windows.) Think of the processor as a brain that receives instructions and messages (i.e. “HOT HOT HOT Burning!!!”) and sends out instructions to other hardware (i.e. “Arm: lift hand” or “mouth: open; vocal chords: scream”.)

What is a Core?

A standard processor has one core (single-core.) Single core processors only process one instruction at a time (although they do use pipelines internally, which allow several instructions to be processed together; however, they are still run one at a time.)

What is a Multi-Core Processor?

A multi-core processor is composed of two or more independent cores, each capable of processing individual instructions. A dual-core processor contains two cores, a quad-core processor contains four cores, and a hexa-core processor contains six cores.

Why do I Need Multiple Cores?

Multiple cores can be used to run two programs side by side and when an intensive program is running (AV Scan, Video conversion, CD ripping etc.) you can utilize another core to run your browser to check your email etc.

Multiple cores really shine when you’re using a program that can utilize more than one core (called Parallelization) to improve the program’s efficiency. Programs such as graphic software, games etc. can run multiple instructions at the same time and deliver faster, smoother results.

So if you use CPU-intensive software, multiple cores will likely provide a better experience when using your PC. If you use your PC to check emails and watch the occasional video, you really don’t need a multi-core processor.

How many cores do i3, i5, and i7′s have?

• A Dual-core processor has two cores.
• A Quad-core processor has four cores.
• An i3 processor has 2 cores.
• An i5 processor has 2 or 4 cores (depending on the model you have.)
• An i7 processor has 2, 4 or 6 cores (depending on the model you have.)

Do I need a Dual/Quad core or an i3/i5/i7?

The reason you’re reading this guide is to find out which type of processor you need. I want to give a simple answer and, if you have more to add, please let us know in the comments. As with all computer hardware, the type of processor you need depends on your needs, for how long you want your computer to stay current, and your budget.

Here’s a very simple breakdown of what you should look to buy depending on your computing needs. All suggestions assume you are buying a pre-built PC (so you don’t have to worry about motherboard and RAM specs and so you don’t have to worry about upgrade compatibility.)

If you:

• Browse the internet, check email, and play the occasional flash game (like Farmville): Get asingle core netbook or desktop (and don’t spend more than $350 USD.)
• Do your word processing, spreadsheets etc. on your PC, listen to music often, and watch movies, get a dual core or i3.
• Play the occasional game and are happy with lower resolution and lower quality graphics (my suggestion assumes the graphics processor on the pre-built PC will be well-matched for the processor suggestions), watch HD movies etc., get a dual core or i5.
• If you do graphic publishing, music creation, programming (and compilation), watch HD movies, and like to play visually appealing games, get a Quad core, i5, or i7.
• If you like to have the very best hardware and play the most graphically intense games, get an i7 Extreme.

This post explains the difference between the Intel Core i3, Core i5 and the Core i7 processors.

Intel Core i3

Codenamed: Clarkdale (Westmere)
Fabrication: 32 nm
Instruction set: X86, X86-64, MMX, SSE 4.2
Socket: LGA 1156
Bus: Direct Media Interface
RAM: DDR3
Chipset Support: P55, H55, H57, Q57

Intel Core i5

Codenamed: Lynnfield (Nehalem), Clarkdale (Westmere)
Fabrication: 45 nm, 32 nm
Instruction set: X86, X86-64, MMX, SSE 4.2
Socket: LGA 1156
Bus: Direct Media Interface
RAM: DDR3
Chipset Support: P55, H55, H57, Q57

Intel Core i7

Codenamed: Bloomfield (Nehalem)
Fabrication: 45 nm
Instruction set: X86, X86-64, MMX, SSE 4.2
Socket: LGA 1366
Bus: Quick Path Interconnect
RAM: DDR3
Chipset Support: X58
Intel has classified the Core processor range into Core i3, Core i5 and Core i7. Both the cost and the performance goes on increasing as you move from Core i3 to Core i7.

Intel Core i3

The Core i3 processors are dual core processors based on the Clarkdale (Westmere) architecture. They have a 32 nm fabrication and work with LGA 1156 socket motherboards. Direct Media Interface (DMI) replaces FSB in the Core i3 processors, unlike the faster Quick Path Interconnect in the Core i7 processors. They have clock speeds ranging from 2.93 to 3.06 GHz. They have 2×256 KB L2 cache and 4 MB L3 cache. They are compatible with these chipsets – P55, H55, H57, Q57. They don’t support Turbo Boost (dynamic overclocking) unlike the Core i5 and Core i7. They also have an Integrated graphics processor. They also have Hyperthreading support.

Intel Core i5

There are two types in Core i5 – Dual core and Quad Core. The dualcore Intel Core i5 processors are similar to the Core i3s while the quadcore Core i5s are much closer to the Core i7 in terms of features.

DualCore Core i5 Processors – They are based on the Clarkdale (Westmere) architecture like the Core i3. They also have a 32 nm fabrication and work with LGA 1156 socket motherboards. Direct Media Interface (DMI) replaces FSB in the Core i5 dualcore processors. They have clock speeds ranging from 3.2 to 3.6 GHz. They have 2×256 KB L2 cache and 4 MB L3 cache. They are compatible with these chipsets – P55, H55, H57, Q57. They support Turbo Boost (dynamic overclocking). They also have an Integrated graphics processor and also include Turbo Boost (dynamic overclocking). They also have Hyperthreading support.

QuadCore Core i5 Processors – They are based on the Lynnfield (Nehalem) architecture similar to the Core i7. They have a 45 nm fabrication and work with LGA 1156 socket motherboards. Direct Media Interface (DMI) replaces FSB in the Core i5 quadcore processors. There are 2 processors with clock speeds of 2.4 and 2.66 GHz. They have 4×256 KB L2 cache and 8 MB L3 cache. They are compatible with these chipsets – P55, H55, H57, Q57. They do support Turbo Boost (dynamic overclocking). However they don’t support Hyperthreading and don’t have a Integrated Graphics Processor.

Intel Core i7

They are the most powerful of the lot. They are based on the Bloomfield (Nehalem) architecture. They have a 45 nm fabrication and work with LGA 1366 socket motherboards. They have Quick Path Interconnect (QPI) which is faster than both DMI in Core i3/i5 and FSB. They are native quad cores which offer the best performance. They have 4×256 KB L2 cache and 8 MB L3 cache. They are compatible with the X58 chipset. They support Turbo Boost (dynamic overclocking) and Hyperthreading (8 virtual cores). However they don’t have an Integrated Graphics Processor.

All the three – Core i3, Core i5 and Core i7 comes with Smart Cache (cache sharing between two cores) and support hardware virtualization.

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