Am i right in calculating

Discussion in 'Hardware Q&A' started by ashfame, Apr 30, 2006.

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  1. ashfame

    ashfame New Member

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    pci bandwidth is 133mbps.
    That means it can transfer 133MB of data per second.
    Now to have 60fps, each frame should not have a size more than 133/60MB = 2.216MB.
    An image @ 1280 * 1024 resolution can't be greater than 2.216MB.

    Then why pci cards are low on performances, i have heard newer games run like a slideshow on them, that's why i have stopped my search for a pci graphics card with 256MB ram.

    Pl tell me where i am wrong?
     
  2. cyrux

    cyrux New Member

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    If your talking about pci-express (16x) cards they have a bandwidth of 8Gbps, i suppose...
     
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    ashfame

    ashfame New Member

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    I am talking about pci not pci-e.
    pci slots are white coloured slots where you insert modem, lan cards etc.
     
  4. drvarunmehta

    drvarunmehta New Member

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    Thats not how graphics cards work. Each frame isn't a seperate image. Every object on the screen is actually a polygon which is rendered according to the players actions and the final output is put on screen.
     
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    ashfame

    ashfame New Member

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    So, is there any way one can calculate fps @ fixed resolution @ fixed refresh rate.

    BTW, Whats the optimum level of refresh rates for newer games.
     
  6. drvarunmehta

    drvarunmehta New Member

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    fps is a characteristic of the game and refresh rate is that of the monitor. For a CRT a refresh rate of 75 Hz is good enough.
    Use Fraps to check your fps in any game. 40 fps should be good enough for most games although it depends on individual preference.
     
  7. Andyiz

    Andyiz New Member

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    Mbps means mega bits per sec
    and MBps means bytes per sec

    When the speed is 133mbps then its equavalent Bytes(Bps) is
    133/8=16.8 MBps

    u r getting confused


    hope this helps
     
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    ashfame

    ashfame New Member

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    @ Andyiz

    I just don't know the bandwidth of pci?
    It is 133MBps or 133Mbps.
     
  9. MysticHalo

    MysticHalo Your Maker.

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    133 megabits=133*10^6 bits=133000000 bits
    133 megabytes=133*1024*1024*8 bits= 1115684864 bits

    MBps=8.3*mbps
    :cool:
    Card processing frequency varies with 64-bit or 128-bit interface....thats how many bits can be exchanged in one cycle.
    But thats not all that matters....your monitor should have enough speed (refresh rate) to display all the frames that the card renders. BTW, ur calculation r completely baseless....its doesnt go like this.
     
    Last edited: May 3, 2006
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    ashfame

    ashfame New Member

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    Fraps shows gta sa running on my Pc @ 10-12fps, but i don't think so.
    For human eye to be not able to distinguish individual frames, 24 or higher frames should pass per sec.
    But i don't think it runs as a slideshow.
    Should i try another benchmark software.
     
  11. Andyiz

    Andyiz New Member

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    Use PCmark. It wil let u know everything u want to.
     
  12. MysticHalo

    MysticHalo Your Maker.

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    Well, 24fps stands valid only if the order in which things r going to be shown stand fixed(like a movie). But in a game, where its not possible to predict what the next frame will be, 24 fps can be distinguished by the eye, hence we have gfx cards that give uto 300 fps on some games (FPS over 24 in a game does make a difference, in a movie, it doesnt) :cool:
     
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    ashfame

    ashfame New Member

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    Its too heavy (35MB).
    I already have Everest Home Edition 2.0
    Suggest a one that is not heavy & has some features Everest doesn't offer.
     
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