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AMD Radeon HD 6850 CrossFire

Discussion in 'Reviews' started by W1zzard, Oct 21, 2010.

  1. Wing_Zero New Member

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    the real number are much better than the 460 SLI ;)
    if you cut out bench and 2 or 3 games that are not well supported: it will read an AVERAGE 90% of increase ;)
     
  2. Bhairava

    Bhairava New Member

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    I'm sure W1zzard, who is respectable and reliable person, and one of the best reviewers we have, will soon explain the reason why he used those numbers.
     
  3. bear jesus

    bear jesus New Member

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    I'm sure w1zzard will be able to explain, that's one of the reasons i didn't put the effort into trying to work it out for myself as i'm sure i would have just missed something... plus i hate math :banghead: but only as i suck at it :laugh:

    But right now all i can do is look at and think about the numbers untill my 6870's arrive during the week and then i won't care about the numbers... i will care about my eyefinity and crossfire problems :roll:
     
  4. Wing_Zero New Member

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    I'm sure too :)
    My purposose was only to show a possibile error in the result summary, to let Wizzard correct it :)
     
  5. pantherx12

    pantherx12 New Member

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    Wing zero are the 6870 scaling graphs correct?
     
  6. Wing_Zero New Member

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    If I had to be honest, I don't like to waste my time to re-do the math also for 6870 crossfire.
    Sorry, that will take time.

    Otherwise, they are very stupid calcs, I'm sure that you can calculate the average scaling increase by yourself ;)
     
  7. bear jesus

    bear jesus New Member

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    I had mainly been looking at the 6870 numbers and i really think they are off as well, they seam to have as many games that scale between 90% and 100% yet have lower scaling percentage in the end of the rerview than the 6850 does.

    I wish w1zzard would come set us straight :laugh:
     
  8. forces New Member

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    where is power consumption and temperatures? a great review has always power consumption and temperatures, if it doesn't it's just a "review" without "great"...
     
  9. pantherx12

    pantherx12 New Member

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    I could, hell I wouldn't even need to do it myself :laugh: Computers do things like this for me now XD

    Will try.
     
  10. Wing_Zero New Member

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    I've sent a pm to w1zzard :)

    Waiting for a public answer :)
     
  11. W1zzard

    W1zzard Administrator Staff Member

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    yes, something seems wrong with the calculation but i'm still looking into where the problem is with my script that generates these numbers
     
    HTC and bear jesus say thanks.
  12. Wing_Zero New Member

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    Tnx for the fast answer! :D

    I'l try to show you where is the error:

    If whe have these values:

    A: is the fps number on single card

    B: is the fps number in Crossfire


    The right calc is this:

    Pecentage Scaling performance from A to B is: [ (B-A)/A ] * 100

    In example:

    A= 60 fps (single card)

    B= 115 fps (Crossfire cards)

    Scaling performance is: [ (115-60)/60 ] *100 ---> this is equal to : +91,66%

    I think instead that you've done [ (B-A)/B] * 100 (instead of A)
     
  13. HTC

    HTC

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    Maybe my math skills suck because i divided the biggest number by the smallest one * 100 - 100.

    Take a look @ post # 86 of the 6870 crossfire numbers: AMD Radeon HD 6870 CrossFire

    @ the time, i didn't include the 3DMark benches as well as Unigine bench (editing and including them now). Did i forget anything else? Maybe we're missing something in our calculations.
     
    Last edited: Oct 29, 2010
  14. Wing_Zero New Member

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    oh yes, that is the same.
    You can also do B/A (where B is the crossfire fps, and A is the single card fps) and then you'll have a number like like "1,XX" where XX is the percentage of increase :)

    look:

    B= 115 fps
    A= 60 fps

    B/A= 1,91 --> 91% of performance increase (if you had as result 2.00 it means a 100% of performance increase). the you moltiply for 100 = 191 and you cut off 100 --> 91.

    It is the same thing i had described in my post ( B/A *100 ) -100 IS MATHEMATICALLY THE SAME OF [(B-A)/A] *100 . :)

    Guys, after all that is only a simple operation. I can't believe at all the problems that this simple op created ^^
     
    Last edited: Oct 29, 2010
  15. Wing_Zero New Member

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    SO HTC, you've done for the 6870 the same thing i've done for the 6850 :D Good!

    So we can say that the scaling summary for both reviews are wrong :/
     
  16. HTC

    HTC

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    Seems so, hehe :)

    EDIT

    Question is: is it wrong for only these reviews?

    Assuming the same script was used for other scaling reviews (ATI and nVidia), this means all those reviews are wrong as well, no?
     
    Last edited: Oct 29, 2010
  17. Wing_Zero New Member

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    ...it is strange but for the NVIDIA-side, they are correct.

    EDIT: W1zzard, I hope that you'll update it very soon...there many people I know that are having a bad idea of 6850 & 6870 crossfire, simply reading the result summary.
     
  18. pantherx12

    pantherx12 New Member

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    Last edited: Oct 29, 2010

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