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                                             Video Card(GFX Card)

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                                             Video Card(GFX Card)

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A GFX card is an expansion card that is responsible for generating images to be output on a display. A video card's core is the graphics processing unit (GPU) which is the main part responsible for all the computations. Graphics cards are usually advertised as dedicated graphics cards, emphasizing the distinction between them and integrated graphics cards. Integrated graphics cards are integrated onto the motherboard or CPU. Dedicated graphics cards are separately added for higher performance.
A graphics card is usually connected to a computer display using VGA, DVI or HDMI cables. Other types include composite video or component video.

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                                             Power Supply Unit(PSU)

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                                             Power Supply Unit(PSU)

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A PSU converts AC to low-voltage DC for the internal components of a computer. Modern PCs use switched-mode power supplies universally. Some power supplies allow manual control of input voltage, while others automatically adapt to the mains voltage. Earlier models of the computers used a heave step-down transformer and linear power supply. The first computer to use switched-mode power supply was the Apple-II in 1977. Switched mode uses a ferrite-cored transformer and power transistors.
Modular PSUs provide a detachable cable system offering the ability to remove an unused connection which helps with increased airflow. Many modular supplies have permanent multi-wire cables but Fully Modular units allow even these to be disconnected.

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                                                      Hard Drive

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                                                      Hard Drive

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A hard disk drive (HDD) is a data storage device that uses magnetic storage to store and retrieve digital information using rapidly rotating disks coated with magnetic material, Due to its random-access method of retrieving data, it can be stored in individual blocks and retrieved in any order rather than being done so in a sequence. HDDs are a non-volatile form of storage, so they will retain data even when power is removed.
Modern HDDs record data by magnetizing a thin film made of ferromagnetic material on a disk.

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                                                    Sound Card

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                                                    Sound Card

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Alternatively referred to as an audio output device, sound board, or audio card. A sound card is an expansion card or IC for producing sound on a computer that can be heard through speakers or headphones. Although the computer does not need a sound device to function, they are included on every machine in one form or another, either in an expansion slot or built into the motherboard (onboard).

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•CPU fetches program instructions from RAM (input), interprets and processes it (execution) and then sends back the computed results so that the relevant components can carry out the instructions.

•A CPU is a complex integrated circuit made of silicon. A modern CPU can have billions of microscopic transistors mounted on it.

•Heat spreader is a part of the cpu

•A CPU that processes one instruction per second will have a clock speed of 1 Hz (Hertz). Based on this calculation, a 3.9 GHz (Gigahertz) CPU is able to process 3.9 billion (3,900,000,000) instructions per second. All things being equal, higher clock speeds = faster CPU.

• CPU core

• 64 bit CPUs are more powerful, x86

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                                                   Motherboard

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                                                   Motherboard

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A Motherboard is the main printed circuit board (PCB) used in general purpose computers and other systems. It is the component that allows communication between the other crucial components. It consists of its own subsystems such as the central processor, input/output of the chipset and memory controllers, interface connectors and other components.
A computer generally has its memory, processor, video card and other components connected to the motherboard. Other peripherals are connected using plug-ins or cables. A motherboard is generally air-cooled with heat sinks mounted on larger chips.

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                                 Random Access Memory (RAM)

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                                 Random Access Memory (RAM)

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It is a form of computer data storage that stores data and machine code that is currently being used by the computer. RAM is normally considered to be a volatile form of memory, where the stored information is lost if power is removed, although non-volatile RAM is also available.
RAM commonly comes in two forms, static RAM (SRAM) and dynamic RAM(DRAM). SRAM is more expensive but is generally faster and requires less power than DRAM. SRAM and DRAM are both volatile, as their state is lost when power is removed. New types of non-volatile RAM are under development. These technologies will use carbon nanotubes and tunnel magnetoresistance.

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Short for Network Interface Card, the NIC is also referred to as an Ethernet card and network adapter. It is an expansion card that enables a computer to connect to a network; such as a home network, or the Internet using an Ethernet cable with an RJ-45 connector.

Wireless network card Due to the popularity and low cost of the Ethernet standard, most new computers have a network interface build directly into the motherboard. The top image shows the SMC EZ Card 10/100 PCI network card, one of the more common examples.
The bottom picture shows a PC Card, more specifically the SMC EZ Card 10/100 wireless network card; found in laptop computers that do not have onboard wireless capabilities.