Uploaded on

 

More in: Technology
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
316
On Slideshare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
7
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. CT10404E PC Technology Week 4 Specifying and buying a PC
  • 2. What’s in store this week…
    • (Brief) Review of Week 3
    • Specifying a PC
      • Needs Analysis
      • Prioritising
      • Shopping around
    • Example
  • 3. (Brief) Review of Week 3
    • Memory
    • Hard Disks
    • Expansion cards
      • Graphics cards
  • 4. Specifying a PC
    • In the past weeks we have looked at some of the components that make up a PC.
    • Many companies will sell you assembled PCs
    • Alternatively you can build your own from components
      • At your own risk!
  • 5. Specifying a PC - Needs Analysis
    • The first thing to do before buying a PC is to analyse your needs.
    • What will be the uses for your PC?
      • 3D animation?
      • Image manipulation?
      • Word processing/DTP?
      • Web browsing?
      • Audio processing?
      • Games?
  • 6. Specifying a PC - Needs Analysis
    • What are the requirements for the tasks we wish to do?
      • 3D Animation
        • processor and graphic intensive
        • storage space required?
        • Memory?
      • Image Manipulation
        • Memory-intensive
        • processor?
        • Storage space?
  • 7. Specifying a PC - Needs Analysis
      • Word processing
        • Does this need anything special?
        • A big monitor?
      • Web browsing
        • A fast internet connection, perhaps.
        • Anything else?
      • Audio processing
        • Memory
        • Storage space
        • Perhaps specialist equipment (professional audio I/O?)
      • Games
        • Everything!
  • 8. Specifying a PC - Needs Analysis
    • We can break down the specification into the base components:
      • Monitor
      • Processor/Motherboard
      • Memory
      • Graphics Card
      • Sound Card
      • Other I/O
        • Modem, Network Card
  • 9. Specifying a PC - Needs Analysis
      • Hard Disk
        • Interface
      • Removable Media
        • CD-Rom, DVD-Rom, CD-RW, Zip, Floppy
      • Input devices
        • Keyboard, Mouse, Games controllers, Graphics tablets
      • Software
      • Support/warranty
  • 10. Specifying a PC - Prioritising
    • When buying a PC there will always be a budget.
      • If money is no object, then why not get the very best of everything?
    • It will be necessary to make trade-offs between performance and price.
    • If the PC is for a private individual, then VAT will be payable (at 17.5%).
    • If buying from abroad, beware of customs charges and compatibility.
  • 11. Specifying a PC - Prioritising
    • The first choice to make is whether to buy a branded model or a generic one (or build your own)
    • A branded model will usually cost more than the equivalent specification of generic PC.
    • But on the flip side, they often come with generous warranties, perhaps including on-site repair.
    • They also often come with software pre-loaded.
  • 12. Specifying a PC - Prioritising
    • The choice of a proprietary machine such as Apple’s Macintosh is an option.
    • A laptop may be preferable over a desktop
      • Laptop has mobility.
      • Desktop tends to be significantly cheaper for similar specification.
      • Desktop tends to have the option of higher-end components if needed.
  • 13. Specifying a PC - Prioritising
    • Whether building your own or buying a ready-made, there will be a choice for each component.
    • A general rule-of-thumb is that you pay a hefty premium to be at the cutting edge of technology.
      • The high-end consumer graphics card over the period 1998-2002 tended to be £300
      • A mid-range card was approximately £80
  • 14. Specifying a PC - Prioritising
    • Another rule-of-thumb is that whatever you buy today will invariably be cheaper tomorrow
      • Today’s top-end card is next years’ mid-range.
    • The trick is to buy only as much as you need - and leave scope for upgrading later.
      • By buying a mid-range card this year, then upgrading next year you will have spent only £160 instead of the £300 buying the card new would have been.
  • 15. Specifying a PC - Prioritising
    • It may help to list the components and try to rank them in order of importance.
      • You could then spend more on the higher-ranked components and less on the lesser-ranked ones.
    • Some components should be viewed as high priority in most cases
      • e.g. Monitor (if the computer is intended to be used for reasonable periods of time)
  • 16. Specifying a PC - Specifying
    • Monitor
      • Options: CRT (Cathode Ray Tube) 14” - 21”+
        • Like a TV
        • Consider refresh rate, visible display, type of tube (normal, FST, trinitron, diamondtron)
      • LCD (Liquid Crystal Display) 15”-18”+
        • A truly flat screen
        • Consider response time, viewing angle, type of display (DSTN or the newer TFT)
      • Plasma screen/Projector
        • Very large sizes
        • Expensive!
  • 17. Specifying a PC - Specifying
    • Processor/Motherboard
      • Number of processors (typically 1 or 2)
        • If you have an operating system that supports it (Windows 2000, Windows XP, Linux), having multiple processors is a cost-effective way of increasing performance
      • Processor speeds and models
        • Typically three tiers of processors
          • High-end server (Intel Pentium 4 Xeon)
          • High-end consumer (Pentium 4, AMD Athlon)
          • Budget consumer (Intel Celeron, AMD Duron)
  • 18. Specifying a PC - Specifying
    • Motherboard
      • Built-in peripherals
        • Graphics
        • Sound
        • Network card/Modem
        • Disk adapters (IDE, SCSI, RAID)
        • I/O (Serial, Parallel, USB, Firewire)
      • Power supply
        • If building a powerful machine, you’ll need a power supply unit (PSU) powerful enough to run everything.
  • 19. Specifying a PC - Specifying
    • Memory
      • Amount and type
        • Almost certainly be dictated by the motherboard.
      • Modern machines have DDRRam and Rambus.
      • Heavy applications will need lots of Ram.
        • Intensive graphics or 3D can use almost as much as you can afford to give it.
        • Don’t go lower than 128MB Ram, in general.
      • Windows 98 cannot properly support more than 512MB of Ram (NT, 2000, XP and Linux can though).
  • 20. Specifying a PC - Specifying
    • Graphics Card
      • Modern cards combine 2D with 3D acceleration.
      • Dedicated Video Ram on board.
      • May offer accelerated DVD decoding.
      • TV Out, Digital Out, multiple monitors.
      • Most modern cards can support very high resolutions and monitor refresh rates
  • 21. Specifying a PC - Specifying
    • Sound Card
      • Higher-end cards may offer Digital out, multiple channels of sound, surround sound, “real-time” digital effects.
    • Network Cards, Modems &c
      • For connecting to networks (see next week)
      • Modems - speed (in Baud), standards (V90, K56)
      • Network cards - speed (in Mbit/s), duplexing
  • 22. Specifying a PC - Specifying
    • Hard disk
      • You pay more for faster access times, more storage space, faster data rates.
      • SCSI or IDE
      • Consider buying multiple smaller drives instead of one large drive (and perhaps RAID - Redundant Array of Inexpensive Disks)
    • Removable Media
      • It is almost essential to have a CD-Rom for most purposes
  • 23. Specifying a PC - Specifying
    • Removable Media
      • DVD-Rom is the next step forward
        • Movies!
      • CD-RW to write your own CDs - 650MB of space on a single CD
      • For a price, you can get a combined CD-RW/DVD
      • Zip disk drive?
  • 24. Specifying a PC - Specifying
    • Input Devices
      • Keyboard and mouse are essential
        • Ergonomic keyboard
        • Optical Mouse
        • Trackball
      • Gaming controllers (if you are a gamer)
        • Arcade stick
        • Joypad
        • Flight Stick
        • Steering Wheel
        • Light gun
  • 25. Specifying a PC - Specifying
    • Software
    • The software you need will depend completely on what you need to be able to do and what software you prefer to use
    • Software can often cost more than the hardware itself
      • Autocad 2002 - £675 inc VAT
    • Ensure you leave money for the software! Some companies have student licenses
      • Autocad 2002 Student - £111 inc VAT
  • 26. Specifying a PC - Shopping Around
    • Shopping around
    • Once you have an approximate specification, its time to go shopping.
    • Follow commercial practice: Look for at least three quotes for similar specification. Weigh up the pros and cons of each.
    • Try online retailers - often sell cheaper than high-street companies due to lower running costs - Look in Computer Shopper for the web addresses, or do a web search
  • 27. Example
    • Specification for a PC used mainly for cutting-edge computer games
      • Modern computer games push the boundaries for consumer PCs.
    • Assume a budget of £1,250.
    • Priorities:
        • High: Video Card. Sound Card Processor Gaming Controllers Keyboard/Mouse
        • Medium: Monitor Memory DVD
        • Low: Hard Disk Modem
  • 28. Example
    • Video Card: GeForce 4 Ti 4600 £223.25
    • Sound Card: Soundblaster 5.1 Digital £52.87
    • Processor: Athlon XP 2100+ £164.50
    • Motherboard: Abit KG7 £81.07
    • Gaming Controllers: Microsoft Sidewinder FF £52.87
    • Keyboard/Mouse: Microsoft Optical mouse £17.62 Cherry non-click keyboard £29.37
    • Monitor: Iiyama 1451 19” £186.82
    • Memory: 256MB DDRRam £51.24
    • DVD-Rom: Philips 16x £41.12
    • Hard Disk: Maxtor 20GB IDE £55.22
    • Modem: £11.75
    • Miscellany (Case, FDD) £80.00
    • TOTAL: £1047.70
  • 29. Example
    • This computer will still need software.
    • Will £102.30 be enough?
    • If not, then perhaps we need to go back and re-evaluate our choices.
  • 30. Practical Work
    • A number of specification exercises
    • Specifics can be found on the MSG at:
    • http://mercury.tvu.ac.uk/pct/
  • 31. Next Week
    • PC Networks and the Internet