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Interface Bandwidth/Card Bandwidth

Discussion in 'Graphics Cards' started by PGdude, 4 Oct 2009.

  1. PGdude

    Wise Guy

    Joined: 3 Aug 2007

    Posts: 2,493

    Location: London

    I have a PCI-E 1.1 motherboard which handles a lovely 8GB/s
    PCI-E 2.0 does a nifty 16GB/s

    Now how on earth do I relate these to graphics cards?

    [​IMG]

    I hear all over the place that PCI-E 1.0 is enough for the 4870, now how do I put those numbers on that there table into perspective for whether or not PCI-E 1.1 can handle a 5850, or even 5870.

    I'm not well versed in this area so please help :confused:
    Thanks.
     
  2. Rroff

    Man of Honour

    Joined: 13 Oct 2006

    Posts: 72,582

    Theres no direct link between the interface bandwidth and the memory bandwidth...

    There is no part of the card spec that can give you a direct pointer as to the interface bandwidth it needs either... its something that you either need a "feel" for or benchmarks to show...

    x8 PCI-e 1.0 could probably feed a 5870 while results would be less than optimal it wouldn't be hideously throttled either... ideally you want atleast x16 PCI-e 1.x which is still sufficent to drive any card out atm - tho that might change with the 5870X2.
     
    Last edited: 4 Oct 2009
  3. PGdude

    Wise Guy

    Joined: 3 Aug 2007

    Posts: 2,493

    Location: London

    My apologies, but I didn't circle those figures, that was just on a review site :p

    How do I know if the card will work at its best on the board?
     
  4. craig3000

    Wise Guy

    Joined: 25 Jan 2009

    Posts: 1,398

    Last edited: 4 Oct 2009
  5. PGdude

    Wise Guy

    Joined: 3 Aug 2007

    Posts: 2,493

    Location: London

    What exactly defines "enough" bandwidth? I'm really confused now.
     
  6. craig3000

    Wise Guy

    Joined: 25 Jan 2009

    Posts: 1,398

    Ok sorry, I meant to say you will not notice a difference if it were v1 or v2 of PCI-E either way so it doesn't matter and you won't need to worry about it

    But then you're also thinking then what's the point of v2, it's just future proofing really, soon PC systems will be capable of using more bandwidth than v1 but by the time that happens you will have upgraded your motherboard and a new motherboard will have at least a PCI-E 2.0 slot so it's not a concern
     
  7. PGdude

    Wise Guy

    Joined: 3 Aug 2007

    Posts: 2,493

    Location: London


    Thanks mate, that clears up concern. I was thinking that we were nearing that limit of bandwidth already y'see. Thanks.