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CONSIDERATIONS

• Color of Case
• Type of Case (Tower case and Desktop case)
• Size of Case

The main and important factor is Upgrade availability in case.

• Please must consider that case have enough slots which will allow you to add additional hard disk CD-ROM, Floppy drives or other drives.
• Other main consideration is that case have the availability for slots for additional cards to be placed in. For Example VGA Card, LAN card and internal Modem.
  NEXT
  CD-ROM drive is used with computer to read the information from the CD-ROM. Today CD-ROM drives have transfer rates ranging from 48X to 75X or more. Generally Purchasing a CD-ROM drive relatively easy task however can involve some considerations when purchasing.
  
  
  Technology of CD-ROM
  Before considering purchasing a CD-ROM it is also good consider the other available options.
  CD-R - A CD-writer or recorder (or simply CD-R drive) is used to write data on CD-R disks. Usually, a CD-writer can read information from CD as well as write information on CD, The locally produced CD-R disks are created with CD writer. The speed of these drives is up to 52X or more.
  CD-RW - You must have a CD-RW drive to write date on the CD-RW. These drives have read and write speed is up to 52X or more but the re-write speed is 10X or more. The CD-RW drive is advanced and more expensive than CD-R drive. It can write data on both CD-R and CD-RW discs and also read data from them
  DVD - DVD stands for Digital Video Disk Versatile Disc. DVD-ROM is an extremely high capacity optical disc with storage capacity from 4.7 GB to 17 GB.
  TRANSFER RATES
  Today CD-ROM  drives have transfer rates or speeds ranging from 52X to 72X or more. For Example, a 52X CD-ROM drive has a data transfer rate of 7,200 KBps (i.e. 48 X 150 = 7200)or 7.2 MBps. It means that the higher the number, the faster the CD-ROM drive. This speed is generally only going to be noticeable when installing a program or copying large amounts of data from a CD.
  DVD drives is used with computer to read the information from the DVD-ROM. Today DVD drives have transfer rates ranging of different capacity. Buying a DVD drive is confusing task, because there are many option for this purpose are available in market. Below we have listed important considerations to look at when considering purchasing a DVD drive.
  Technology of DVD Drives
  Before considering purchasing a DVD drives, it is also good consider the other available options.
  CD-R - A CD-writer or recorder (or simply CD-R drive) is used to write data on CD-R disks. Usually, a CD-writer can read information from CD as well as write information on CD, The locally produced CD-R disks are created with CD writer. The speed of these drives is up to 52X or more.
  CD-RW - You must have a CD-RW drive to write date on the CD-RW. These drives have read and write speed is up to 52X or more but the re-write speed is 10X or more. The CD-RW drive is advanced and more expensive than CD-R drive. It can write data on both CD-R and CD-RW discs and also read data from them
  DVD - DVD stands for Digital Video Disk Versatile Disc. DVD-ROM is an extremely high capacity optical disc with storage capacity from 4.7 GB to 17 GB.
  TRANSFER RATES
  DVD-ROM  is an extremely high capacity optical disc with storage capacity from 4.7 GB to 17 GB. DVD disc is specially use to store movie films. It is also used to store huge database, music, complex software etc.
  OTHER CONSIDERATIONS
  There are some other important considerations to look at when purchasing a computer DVD drives include:
  DVD option: DVD-R, DVD-R DL, DVD+R, DVD+R DL,DVD-RW, DVD+RW, DVD+RW DL, DVD-RAM.
  Warranty:  How long is the warranty and what does it cover.
  Support : Is the technical support number a free number is it open 24 hours 7 days a week.
  
  
  CPU
  Processor is considered the brain of the computer. The CPU fetches instructions of program from main memory and executes them one by one. The speed of the CPU is measured in Mega Hertz or Giga Hertz and speed from 500 MHz to 3.4 GHz, it depends upon a user needs, that is why purchasing a processor is an important consideration when building or buying a computer. There are several considerations and additional information about what to ask and look for when purchasing a processor directly or already installed into a computer. 
  
  
  TYPE
  The type of the processor can be very important consideration for users who are building a computer. The main thing in processor is the compatibility with the motherboard, Because the processor chip is plugged into the motherboard. Today there are many processor manufacturers AMD, Motorola and Intel. Final decision to buy a processor  depends upon user need for example a home or basic user can buy Intel Celeron or AMD processor. If you can afford then must go for latest processor if you want your computer to retain functionality for four to six years. When considering any of the above companies product ensure that a motherboard that is compatible with that product is also purchased. For example if an Intel motherboard is purchased or currently installed into the computer you will want to consider an Intel Processor.
  
  
   Monitors
  These are two basic type of monitor that are used with personal computer, CRT Monitor and Flat-Panel Monitor. Flat Panel is a relatively new technology when compared to the CRT or standard monitor technology. Due to new technology some important considerations to look at when purchasing a flat panel Monitor.
  Technology of LCD
  There are two categories of LCDs then Before looking at what type of configurations you need to look for when purchasing a computer Flat Panel it is important to know if you want Active Matrix LCD or Passive Matrix LCD.
  Active Matrix LCD : Active Matrix LCD uses a transistor for each liquid crystal cell or pixel and thus displays high quality images. Active Matrix LCD is also known Thin Film Transistor(TFT) display. Today, new generation of TFT is called organic LED that displays brighter images than standard TFT display. The organic LED uses organic molecules to generate output on the screen.
  Passive Matrix LCD : Passive Matrix LCD uses fewer transistors and requires less power than active matrix LCD. The colors on Passive Matrix LCD are not bright as compared to active matrix LCD.
  Resolution
  The quality of LCD screen depends on its resolution, which is generally proportional to the size of screen.
  15" flat panel monitor typically has a resolution of  800 x 600 / 1,024 x 768
  17" flat panel monitor typically has a resolution of  1,280 x 1,024
  19" flat panel monitor typically has a resolution of  1,280 x 1024
  21" flat panel monitor typically has a resolution of  1,600 x 1,200.
  
  
  
  
  Computer memory.
  The Computer memory plays very important role in data processing. Computer memory means the computer can use powerful program with large size. It also improves the data procession speed of computer, that is way it is very important to verify When purchasing a computer memory, this memory is suitable for your computer and needs. Below is a listing of different considerations and tips to look for when purchasing computer memory.
  Type Of Memory
  There are many types of memory available in market, Before purchasing any memory or considering purchasing memory it is important that you distinguish the type of memory that is required. Below is a listing of some of the configurations of computer memory.
  Memory type: SIMM, DIMM, RIMM, 
  Amount of Pins: 72-Pin, 30-Pin, etc..
  Speed of memory: 10ns, 60ns, 70ns, etc..
  Below is a listing of additional considerations to look out when purchasing computer memory.
  
  
  Motherboard

  The motherboard is the main circuit board of the system unit. You can say that motherboard is the master circuit board in the computer. Many new user of computer are not well aware about motherboard that is why for users planning on building a computer a motherboard can be a confusing decision. Below we have listed some considerations and tips when looking at purchasing a computer motherboard.

   here are many factor of the motherboard is a crucial consideration when looking at a motherboard.
  

  PC motherboard has two or more expansion slots used to add new components to the computer. The memory chips are also inserted into the expansion slot to expand the size of memory. Given option are very important in any motherboard for example:

  Accelerator: It is used to increase the speed of processor.

  I/O: It is used to connect input/output devices such as printer, mouse and keyboard.

  Game: It is used to connect joystick.

  Disk Controller: It is used to connect disk and CD drives.

  Modem: It is used to connect other computers through telephone line or cable telephone line.

  TV Tuner: It is used for viewing television channels on the computer monitor.

   PRINTERS
  
  
  These are most commonly used output devices used to get prints of documents on the pager. Different printers have different mechanisms. Therefore purchasing a printer can be a sometimes confusing task. The following is additional information that will help in your purchasing decisions.
  There are many types and technology of printer are available in market but the most popular and commonly used  are inkjet and laser printer.
  Ink Jet Printer. The inkjet printer is not-impact character printer and prints one character at a time. The printing quality of inkjet printer is measured by the number of tiny ink of drops per inch(dpi). Most inkjet printers range from 300 to 2400 dpi. Printers with higher dpi usually are more expensive but having high printing quality. The speed of an inkjet printer is measured by the number of pages per minute (ppm) it can print. Its printing speed is up to 15 ppm. Therefore purchasing a printer can be  depends upon printers dpi and ppm but It depends upon user need.
  Laser Printer. A Laser printer is the fastest and high quality printer, but a laser printers are more expensive than inkjet printers and their print quality is also higher. The print quality and printing speed of laser printers make them ideal for offices and business. The laser printer can print text and graphics in very high quality resolution. The commonly user laser printers have resolution of 300 or 600 dpi and printing speed is from 5 to 30 ppm. The high quality laser printers have resolution from 600 to 2400 dpi. The printing speed of these printers is also more than 150 ppm.
  Speed and price range
  The price of laser printers depend on the quality and printing speed. The color printers are more costly than black-and-white laser printers. The higher the resolution and speed, the more expensive the printer.The price range can vary depending upon the quality of the printer and the type of printer for example inkjet, laser printers.
  READY TO BUY
  Once you have reviewed the appropriate information and believe that you are ready to make a purchase of a printer ensure that the source which you plan on purchasing the printer from is a reputable source and you have reviewed our section on what to look out for when purchasing over the Internet.