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  1. #1

    Post HD 4850 Crossfire tested







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    http://bbs.chiphell.com/viewthread.p...extra=page%3D1

  2. #2
    well according to the GT200 scores in the other thread, 2x4850 has a higher score in vantage then GTX 280. --- both tested with same CPU too

    if this is true, great news

  3. #3
    Yeh just before 1 week, I wondered if AMD will make 4850 X2 card like 4870 X2, that 4850 X2 will fill a big gap in my opinion

  4. #4
    Quote Originally Posted by junkmonk View Post
    well according to the GT200 scores in the other thread, 2x4850 has a higher score in vantage then GTX 280. --- both tested with same CPU too

    if this is true, great news
    The cpu that was tested with the GTX280 was a QX9650 but clocked at 3GHz. While this is in 4GHz. So, I conclude that 2xHD4580 = 1xGTX280 in terms of performance and at its price of $240x2 vs $600 USD, looks like crossfire capable systems have a winner!
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  5. #5
    I think Iversongarnett is right,
    If you look at this post: http://forums.vr-zone.com/showthread.php?t=287812
    you can see the scores on just the GPU are about even.

  6. #6
    pretty good for a single card, and it's HD4850 and not HD4870. CFX will beat 3-sli, if the results are correct

  7. #7
    Quote Originally Posted by keymaster07 View Post
    pretty good for a single card, and it's HD4850 and not HD4870. CFX will beat 3-sli, if the results are correct
    Especially HD4870X2 which is rumored to have a shared memory controller and memory.

  8. #8
    spitting mad MrBungle's Avatar
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    Quote Originally Posted by keymaster07 View Post
    pretty good for a single card
    is says CrossFire in the title.

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  9. #9
    Quote Originally Posted by keymaster07 View Post
    pretty good for a single card, and it's HD4850 and not HD4870. CFX will beat 3-sli, if the results are correct
    This is benched in crossfire mode, not single card. And no, CFX will not beat 3-sli in terms of 3xHD4870 vs 3xGTX280. CFX will only win in terms of price vs performance ratio.
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  10. #10
    Quote Originally Posted by Nuker_ View Post
    Especially HD4870X2 which is rumored to have a shared memory controller and memory.
    That rumor is hard to believe unless its memory controller is not build into the die of the GPU, or they re-design the RV770 core without a build-in memory controller, not just slapping 2xRV770 cores onto one PCB.
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  11. #11
    Quote Originally Posted by IversonGarnett View Post
    This is benched in crossfire mode, not single card. And no, CFX will not beat 3-sli in terms of 3xHD4870 vs 3xGTX280. CFX will only win in terms of price vs performance ratio.

    In thousands

    GTX 280 is 10.8
    4850CF is 11.9
    4850 is 7.05

    CF Scaling is 168%

    "4870" is 7.05*1.25 = 8.8

    "4870 CF" is 8.8*168% = 14.78

    In Tri-SLI, GTX 280 gets 21.3.

    QuadCF should beat TriGTX on Vantage only, but might not be too good in the DX10 stuff unless they changed that (not that Tri-SLI even helps in most games though). However, 2 4870s are quite close to 2 GTX280s, 3 should overtake them.

  12. #12
    Quote Originally Posted by MrBungle View Post
    is says CrossFire in the title.
    my bad, but if CFX then it'll beat or very close to 3-sli GTX280

    3-sli GTX2xx is hot!...i think i would be hotter than CFX HD4850(single slot)

  13. #13
    Quote Originally Posted by Tchock View Post
    In thousands

    GTX 280 is 10.8
    4850CF is 11.9
    4850 is 7.05

    CF Scaling is 168%

    "4870" is 7.05*1.25 = 8.8

    "4870 CF" is 8.8*168% = 14.78

    In Tri-SLI, GTX 280 gets 21.3.

    QuadCF should beat TriGTX on Vantage only, but might not be too good in the DX10 stuff unless they changed that (not that Tri-SLI even helps in most games though). However, 2 4870s are quite close to 2 GTX280s, 3 should overtake them.
    If we assume CFX scales decently and 4870 adds another 30% over 4850 then CFX will get 2.36 * 7.05 * 1.3 = 21.63. Quadfire will then be superior to triSLI.

  14. #14
    Quote Originally Posted by IversonGarnett View Post
    That rumor is hard to believe unless its memory controller is not build into the die of the GPU, or they re-design the RV770 core without a build-in memory controller, not just slapping 2xRV770 cores onto one PCB.
    The rumor goes like this: ATI has designed a new bridge chip that allows one RV770 to "see" and access the contents of the other RV770's memory pool. So it is shared memory, but technically there would still be two memory pools (512MB or maybe 1GB for each RV770 core).

    Another rumor is that ATI has built-in a special "link" into the RV770 cores, and each core will talk to the other directly; no bridge chip at all. If that is true, than R700 would solve a lot of problems associated with the current CrossFire/SLI designs.
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