HD 3850 in CF?

Discussion in 'Videocards - AMD Radeon' started by rioter, Jan 7, 2008.

  1. rioter

    rioter Member

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    ASUS EAH4850
    I just bought a ASUS HD 3850 256mb and I'm loving the card ATM(beat the crap out of my old 6800 gts). I'm getting a new CPU, mobo and mem asap. I was wondering should I get a CF mobo and hook up 2 cards?

    If I do that then I got some q's.

    My main questions are:

    Can I buy a 3870 and put that to work with my 3850, and will it be better than 2 3850's?

    If I buy the 512mb version of 3850 and use that as my "main" card, will it work better than having 2 256mb versions?

    Thanks in advance.
     
  2. Apoc_

    Apoc_ Master Guru

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    I would recommend a CF board, yes. The 790FX atm is about the best you'll find. And no, I don't think you can buy a 3870 and run it with your 3850.

    If you're looking into CF I would advise you to buy two 3870's. If that is too expensive then I would get two 3850 and whether or not you want the 512meg or 256meg version depends on what resolution you play at. If you play at a high resolution then I would buy the 512meg version, if you play at 1024x768 like myself then the 256meg version is fine.
     
  3. rioter

    rioter Member

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    Buying 2 3870's is out of my range right now, since I alreayd went and bought the 3850(it was so cheap and reviews loved it).

    Would I see any improvement buying the 512mb as the mastercard and having the 256 as a slave compared to having both 256mb cards?

    I'd like to play 1280x1024.

    I'm planning on dropping AMD and going with a dual or quad core intel, as it seems that they perform a lot better than anything that AMD has out right now atleast in the money vs performance comparisons.
     
  4. rioter

    rioter Member

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  5. non

    non Member

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    Yes u can, in fact i did a test review about it. U can check here :
    http://forum.chip.co.id/graphic-display/92189-crossfirex-real-game-test-3870-3850-ix38.html

    Yeah, i know it's in indonesian but at least picture/screenshots worth thousand words

    They will work independent, u can adjust the clock for each card differently with..too bad...catalyst. Or U can adjust in riva separately before u enable the crossfire mode

    Best mainboard for CF is abit IX38 QuadGT. It's pcie 2.0 and gives u balanced bandwith(16x2) plus abit is the only x38 board with 3 pcie slot. Anytime the driver ready u can just plug 3 cards there...
     
  6. Knighthawk1234

    Knighthawk1234 Member Guru

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    you can use 1 3850 and 1 3870 in CF. it works fine. same chip.
     
  7. rioter

    rioter Member

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    Thanks for the answers guys.
     
  8. Blacklash

    Blacklash Member Guru

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  9. Wendig0

    Wendig0 Master Guru

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    The question is, if you run a 3870 and with one of the older 3850's that have 256mb then will the 3870 not use all of its 512mb mem or will it only limit itself to 256?
     
  10. gurusan

    gurusan Master Guru

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    correct. it will also downclock to the 3850 clock
     

  11. tuco

    tuco Ancient Guru

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    If your considering x-fire, then the p35 mobos are limited to one lane @ x4 pci. You would be better served with an x38, and they do not come cheap.
     

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