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HD4870 + HD4890 Crossfire?

Discussion in 'AMD / ATI' started by Crusader, Aug 24, 2009.

  1. Crusader

    Crusader New Member

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    Basically, I want to know if it works and how well/poor it works if that's the case.

    I was planning on getting a second PowerColor(PC) 4870 PCS+ 1gb to go with mine, but the site I've made the order from (order is numerous other things as well, so not bothering to cancel, also already been paid lol) has ran out and can't get any more.

    So, my options are a PC 4870 1gb, or PC 4890 1gb (I'd like to keep it PowerColor, for the whole similarity thing). The 4890 is pretty much the same price as the PCS+, but I'd assume with more "grunt", so I was thinking of getting that but I've heard that 4890+4870 combo's don't work out so well - if at all.

    Any advice from the TPU community would be great :toast:
  2. DrPepper

    DrPepper The Doctor is in the house

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    4870 and 4890 would work well in crossfire but it would only be as fast as the slowest card.
  3. Crusader

    Crusader New Member

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    Ahh, well it would only be as fast as the 4870 anyway.. which is underclocked 20mhz cause I'm too lazy to flash the BIOS, lol.
    Well, since I've already paid them for the PCS+ I might as well grab the 4890, I should be able to get more money out of it as a single card compared to the 4870 when I sell it in a year or two :D

    Though more input would be nice haha :)
  4. Mussels

    Mussels Moderprator Staff Member

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    4870 and 4890 share everything in common except clock speeds, and those arent synchronised in crossfireX.


    He would actually get a 4890+4870, it wouldnt drop down to work like two 4870's
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  5. Crazykenny

    Crazykenny

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    Agreed, it wont work like memory which automatically gets clocked down to the slowest module. I have yet to see someone that successfully gets two different cards to work together.
  6. Mussels

    Mussels Moderprator Staff Member

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    i did it. radeon 3200 IGP 256MB + 3450 PCI-E 512MB card. you cant get much more different than that.
  7. Crazykenny

    Crazykenny

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    Wow, I didnt even think it was possible. But you cant tell me they ran normally right? If so... that what about the SLI side of things? GTX280 ~ 285.
  8. Mussels

    Mussels Moderprator Staff Member

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    SLI is a no go. SLI requires matched cards with matched BIOS'es and everything looking like siamese twins.

    CrossfireX is a different beast altogether - as long as they share the same GPU core, they can crossfire.
  9. Crazykenny

    Crazykenny

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    I must note... I'm glad I switched to ATI with my current rig then. Never knew the possibilities on ATI cards would go this far. But what will Crossfiring with a different card do to performance? I mean a 4870 can never match up to the new 4890 series at stock.
  10. phanbuey

    phanbuey

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    nothing.. it will be like having hd4880's in cfx :laugh:
  11. Crazykenny

    Crazykenny

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    Hahaha, awesome :D You learn something new every day :p
  12. Wile E

    Wile E Power User

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    BIOSes no longer have to be matched in SLI, but it does have to be the same model cards, and it still takes the lowest common denominator approach.

    And just to reiterate your point, Crossfire does not take the lowest common denominator approach, therefore a 4890+4870 is faster than 2x4870.
  13. DrPepper

    DrPepper The Doctor is in the house

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    I thought clockspeeds have to be matched with xfire. Nice to see it doesn't.
  14. Crusader

    Crusader New Member

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  15. tzitzibp

    tzitzibp New Member

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    quick question, slightly off topic...

    can a 4870 cooler be installed on a 4890 !!!????
  16. eidairaman1

    eidairaman1

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    You do some testing of this yourself? I'd like to know where you got this data from.
  17. Mussels

    Mussels Moderprator Staff Member

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    crossfires been getting better and better, SLI is still in the same boat as when it launched really.
  18. Hayder_Master

    Hayder_Master

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    yeh it is work well crossfire depend on the chip series , i crossfire my 4870 with 4850 and work well
  19. Crusader

    Crusader New Member

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    It's going in the new mobo in my specs for Yorky system, X48 chipset.
  20. tzitzibp

    tzitzibp New Member

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    anyone!?
  21. Crusader

    Crusader New Member

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    No idea mate, sorry :eek:

    Actually it wouldn't surprise me, they are basically the same card. Same GPU at least..

    "The Thermalright T-RAD² is a slim high performance heatsink capable of cooling the latest gaming cards, including the Nvidia GTX-200 series and ATI 4000 series video cards."

    So um yeah, they probably do :)
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  22. Mussels

    Mussels Moderprator Staff Member

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    as long as you make sure the VRM's are cooled, it should work.
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  23. Scrizz

    Scrizz

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    I love crossfireX
  24. Flyordie

    Flyordie New Member

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    It used to be that way, that ended with the HD2xxx series...
  25. Wile E

    Wile E Power User

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    I haven't tested 4890+4870, but I have tested 2x4850 vs 4850+4870 vs 2x4870. And that is the exact order of speed they come out at. ATI does not use the lowest common denominator approach at all. If one card is faster, it leverages it's power more than the slower card.

    I should mention, there are likely exceptions. I'm guessing AFR rendered games probably slow the faster card down a bit, as it waits for the slower card to render it's frame.
    Crusader and eidairaman1 say thanks.

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