Crossfire 6870 and 6850

I have installed both a radeon 8650 and 8670 card with drivers from amd website. I've ran each of them separately without any problems, and bench marked them using 3Dmark06. 6870 scored 18369 3DMarks, 8650 scored 17630 3DMarks.
I'm unsure how to rate these scores, as the website will not allow me to "add to compare" list because my settings apparently are not set to default. Can anyone suggest a freeware program to rate performance?
I'm ready to crossfire them, but would like to know where I'm at before I get started.
13 answers Last reply
More about crossfire 6870 6850
  1. you can crossfire identical cards
  2. @Alvine - The AMD CrossfireX Chart shows that you can crossfire the HD6870 with the HD6850 as well as other similar card combinations.

    Sorry Mobo, but I don't have any other information for you.

    -Wolf sends
  3. ah sorry i thought they were more strict like nvidia
    you can use windows experience index as your reference
    also try passmark, furmark
  4. crossfiring 6870 and 6850 it's not a good idea..

    it's slower than cf 6850.

    sell your 6870 and grab another 6850..
    or,
    sell both of your graphics card, and grab at 7850 or 7870.

    almost same performance raw but without multicard issue...*and less power*
  5. If things still hold true,they will both run as 6850 crossfire,the 6870 will downclock to the 6850's speeds.
    where your at will depend on system specs/games/resolutions etc...

    picked the 1st one on google
    http://www.techpowerup.com/reviews/ATI/Radeon_HD_6850_CrossFire/

    also(hopefully link is right)
    http://www.anandtech.com/bench/Product/301?vs=302

    A 6870/6850 setup will run exactly as a 6850 xfire setup,if you o/c the 6850 to a 6870,it will run as a 6870 xfire.

    however,I have been very lucky and have never had any issues with xfire(all series since the 3xxx's)
  6. Thanks, I did keep searching and ran a bench mark on the Radeon HD 6870 using cinebench freeware. It's running 51.9 fps.

    The CPU, AMD Phenom II X4 965 Black Edition Deneb 3.4GHz scored 3.75 pts in a rendering test.

    I was expecting more fps, is the CPU bottle-necking?
  7. @ Earnie, thanks for the great links!

    other specs at

    Speccy Snapshot
    http://speccy.piriform.com/results/5DMuzcrB44cIzOEL2UDUYQD
  8. Mobo Mojo said:
    Thanks, I did keep searching and ran a bench mark on the Radeon HD 6870 using cinebench freeware. It's running 51.9 fps.

    The CPU, AMD Phenom II X4 965 Black Edition Deneb 3.4GHz scored 3.75 pts in a rendering test.

    I was expecting more fps, is the CPU bottle-necking?



    your CPU is fine,Have you ever tried to O/C it?
  9. I haven't tried O/C yet, I'd like to establish where I'm at now first.

    I compared my results to tests using 3dmark06 at 1920x1200

    http://www.techpowerup.com/reviews/ATI/Radeon_HD_6850_CrossFire/21.html

    My 6850 card alone scored slightly higher (17630 3Dmarks vs 17383), but when I
    put it in crossfire with the 8670, I scored 19192 vs their result of 23681.

    I assume the 6870, installed in the PCIe #1 slot, will be seen as the master, while the 8650 in the #2 will be the slave.

    Also my Win Dex graphics dropped from 7.8 for the 8670 alone to 7.7 when in crossfire, which was where I started when I had the 6850 running alone.

    Once I get all this stabilized, I'll try O/C.
  10. Make sure you have the secondary graphics card in the correct slot. From the specs on your motherboard:

    Quote:
    If you want to install two graphics cards, please use PCI_E1 & PCI_E5 slots


    -Wolf sends
  11. Thanks, Wolf
    Tryout tonite let you know...
  12. No big change with 8670 in slot 1, 6850 in slot 5.

    I scored 19092 (-100 from prior result) vs their result of 23681, for two 6850s Xfire.

    fps change is very slight.

    Any thoughts other than selling and just get a 7000 series?

    I'd be happy just to know I'm getting everything I can from
    this cross-fired setup.

    I had an issue with the Hero Editor in Darkspore producing glowing
    bodies and weapons. It stopped when I returned to the 6870 alone.
  13. Updated information

    I've been running that 6850 card, but wanted to boost things up to power two 23" monitors and keep max graphics settings, plus fps.

    I added an 6870 in crossfire (both are AMD radeon xfx cards)

    I assume the 6870, installed in the PCIe #1 slot, will be seen as the master, while the 8650 in the #2 will be the slave. That's where I started.

    I moved the second card to the PCIe #5 slot, as Wolfshadow suggested,
    without any measurable change.


    4.30.12 Driver and Catalyst versions

    Driver Packaging Version 8.951-120308a-135594C-ATI
    Catalyst Version 12.3
    Provider Advanced Micro Devices, Inc.
    2D Driver Version 8.01.01.1235
    2D Driver File Path /REGISTRY/MACHINE/SYSTEM/ControlSet001/Control/CLASS/{4D36E968-E325-11CE-BFC1-08002BE10318}/0002
    Direct3D Version 7.14.10.0894
    OpenGL Version 6.14.10.11566

    I had a decrease in performance when benchmarking the crossed and uncrossed configurations within the DiRT 3 benchmark.

    DiRT 3 benchmark 4.30.12

    Resolution 1920 x 1080 running one 23" monitor
    Refresh Rate 60
    Multisample 4x MSAA
    VSYNC OFF
    Aspect Ratio AUTO

    All other Graphics HIGH
    Post Processor HIGH

    6870 PCIe slot 1
    fps AVG 85.7, MIN 65.5

    6870 PCIe slot 1
    6850 PCIe slot 5
    fps AVG 68.9, MIN 52.3

    Bottom line:
    The 6850 did fine alone
    The 8670 did better alone
    The two cards in crossfire did not increase performance. They together preform at a lower fps than the 8670 alone.
    And, in crossfire, they are not even close to results I've seen for two 8650 in crossfire, which is not what I would've expected.
    (Quaddro warned me earlier in this thread)

    6850 cross fire test
    http://www.techpowerup.com/reviews/ATI/Radeon_HD_6850_CrossFire/21.html

    I'm looking for a performance level that is at least twice that of the 8650 alone.

    Has anyone used the AMD overdrive to speed up a card?
    How much would I safely speed it up to better match the 6870?
    From what I've read, it should handle 80-90c, although that's high.
    Is this a Catalyst version 12.3 issue?

    I hope someone out there has been through this and can tell me what they did.

    Thanks in advance,
    Mo

    I have additional specs here:
    http://speccy.piriform.com/results/pg0NyWfryscPfqrbLqqqH3w
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