Amd radeon hd 6850 crossfire pci-ex4

I would like make crossfire with two AMD HD 6850 Graphics cards and use for this solution Motherboard ECS H67 H2-A3 with 2 PCI-Ex16, but one from them worked as PCI-Ex4.
Please help me, is it posibility? Or not?
Thank you fot your help!
My e-mail:
6 answers Last reply
More about radeon 6850 crossfire
  1. You shouldn't loose that much performance,roughly 5%-15%.But I would make it a goal to upgrade to a better mobo.

    What are your full system specs?(CPU,RAM,etc.)

    What is the make/model of your PSU?
  2. Both cards will run a PCIe x4 now when you put in the second card. Need to up grade your MOBO.
  3. Are you sure about that? Not trying to argue, I have only been running Crossfire for 3 months now.

    I am running a Biostar H67 with 16x Main and if the second one is used it runs at 4x. I have been running my two HD6770s and they are showing 16x in the primary and 4x in the secondary. What surprised me is my friend is running a AsRock Z68 which is supposed to be running at 8x and 8x in Crossfire (yes way better board than mine). He and I are running same video and same CPUs (i5-2500k) and yet his score under 3DMark2006 was only 300 points higher. Based on FPS scores he is less than 2% faster. I give that boost to him running faster RAM (1600 vs. 1333).

    This is the board I am running. I only paid $50 for it so I have no complaints.
  4. I could be wrong but some one I believe told me this some time ago and made reference to that. I haven't check my cards to see if that runs true. If I can find that post I will repost it. You hear so much on hear some bad and a lot of good.

    I could have got my wires crossed also. Since you have me thinking on this point I will now get to the bottom of it and I didn't take your opinion in any way but the highest respect. Thank you for pointing this out.
  5. Thank you for the reply. Some people take what I post out of context sometimes.

    Did you find it easy to overclock your Z68? I build custom PCs for friends and family and hope to sell this Biostar to one of them. The board is excellent for gaming and everyday use but I wanted to try overclocking like I did with my old Q9650 but little did I know the H67 chip-set doesn't allow overclocking of any kind. I have been looking at the AsRock Z68 ( which was my first choice. I just couldn't say no to this board for $50.


    Biostar H67 TH67+
    i5 - 2500k
    G.Skill Sniper RAM 2 x 4GB @ 1866mhz (running at 1333mhz)
    Gigabyte HD6850 Windforce (Primary PCIe)
    Maxsun HD6790 (2nd PCIe)
    Corsair Force 90GB SATA-3 SSD
    3 x 1TB Samsung 7200 Drives (RAID 5)
    Samsung Blue-Ray Combo Drive
    KingWin 1000 watt Modular PS
  6. ^^ Nice rig by the way. My Z68 is nice and easy, the only thing I have OC'd is the CPU and it is at 3.9. My cards came OC'd and the reason I not going full out on any of it is because my PSU is crap.

    Your link just takes me to the page with all MOBO's and it said it was deactivated. Anyway you should look into the 3rd Gen of MOBO's since everything is starting to go that way.
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