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5770 crossfire 16x/4x

Discussion in 'AMD / ATI' started by metafan, Jan 2, 2010.

  1. metafan New Member

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  2. El_Mayo

    El_Mayo

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    i read somewhere it x4 offers only slightly reduced relative performance of x16
  3. metafan New Member

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    so what do you think ?
  4. Goodman

    Goodman

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    I did some test with single card (3Dmark & some games) on my crossfirex board (1x16 & 1x8) i didn't see any difference between both & all i'ved got was about 20 points more in 3dmark06 in x16 slot but that was it lol!

    So between x8 or x16 there is not really a difference but your's is x4 & pci-e 1.0 or 1.1? , so it may do much difference in your case but i'm not sure?
  5. metafan New Member

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    PCI-Express 2.0 x16 electrical x4
  6. MKmods Case Mod Guru

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    what mobo do you have?
  7. metafan New Member

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  8. MKmods Case Mod Guru

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    The reason for asking is (I am no intel expert) but isant the P35 a PCI X 1.0?
    (if so I dont think X4 would be cool even for the second card)

    I run a pair of 5770s on PCI X 2.0 X16's and they are fine but I wish I had gone with a 5850 instead (and added another later if needed)
  9. metafan New Member

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    ?? i don't know ??
  10. MKmods Case Mod Guru

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    Im pretty sure it is, if so than a x4 on a modern mobo would be like a X2 on yours (and that wouldnt be good for the 5770) Im sure it would work ok but the prob is you are paying top dollar for the GPUs and to lose a chunk of performance on ur mobo its just wasting money.

    What size LCD are you using? I run a 24" and the 5770s are fine but I wish they were more (especially for their cost)
    If you have anything smaller than a 24 that a single 5850 is plenty (I know they are hard to find and $$ now but in a short while when Nvidia releases its new cards they should be cheaper and more plentiful)

    Oh yea, what GPU are you using now?
  11. scope54

    scope54

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    p35 only supports pci-e 1.1
  12. metafan New Member

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    1600x900
    "p35 only supports pci-e 1.1" :( but the first pci-express 16x is 2.0 ?
  13. DrPepper

    DrPepper The Doctor is in the house

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  14. metafan New Member

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    it's the first time i heard that :)
    so 5850 (or any) on a 16x 2.0 will be weaker then on 16x 1.1 ?
  15. MKmods Case Mod Guru

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    Nope PCI Express 2.0 is allows double the bandwidth of a PCI Express 1.0/1.1 (basically on your mobo(1.0/1.1) the X16 is equal to a modern mobo(2.0) thats X8)

    And the second card dosent need as much bandwidth as the first one but to run a card as expensive as the 5770 on a PCI X 1.0 at X4 is a waste of money. (It will work but its just a waste)

    The single 5850 is a much better option.
    Last edited: Jan 3, 2010
  16. DrPepper

    DrPepper The Doctor is in the house

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    No it should be fine.
  17. metafan New Member

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    so i have to wait for 5850 price's to drop and get one
  18. DrPepper

    DrPepper The Doctor is in the house

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    Not likely to be anytime soon. By the time they do chances are better cards will be round the corner.
  19. MKmods Case Mod Guru

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    They were supposed to be $279US and I think thats a reasonable price for them.

    But lower is always better
  20. InnocentCriminal

    InnocentCriminal Resident Grammar Amender

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    Definitely recommend you fill in your System Specifications metafan.

    No point going over the same ground, but unfortunately you're going to notice a pretty big performance hit if you go down the Crossfire route. Depending on what the rest of your specification is, upgrading your GFX might not be as easy as you think...
  21. erocker

    erocker Super Moderator Staff Member

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  22. metafan New Member

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    i will change first my processor and wait a little for the graphics, and what do you think about that motherboard should i change it too ?
  23. DrPepper

    DrPepper The Doctor is in the house

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    changing cpu and motherboard so you can get two 5770's will cost more than just getting a 5850
  24. metafan New Member

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    Yeah for the motherboard i can wait, but you see my cpu it will limit the config
  25. DrPepper

    DrPepper The Doctor is in the house

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    Might as well get the 5850 now then upgrade the rest. Unless you upgrade to x58, p55 or phenom II you'd be cheaper just getting the 5850 even though there might be some bottleneck.

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