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Do you have 1 or more 7970's + Eyefinity? If so, i need your help... Please read on.

Discussion in 'AMD / ATI' started by Stu @ MSD, Mar 20, 2012.

  1. Stu @ MSD New Member

    Mar 19, 2012
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    Hi guys,
    Ok, This is the scenario... Please bear with me. :)

    Since buying my 7970's I have been constantly testing and battling with OC settings, with my cards not liking to run over 1050 on the core regardless of voltage used. As soon as I try 1075 or above...BSOD 116.

    Whilst i realise that on overclock is not guaranteed, I have discovered something interesting that proves in my case, its not just poor cards... read on. ;)

    I have 3x 7970's now, and recently tried swapping cards around to see if it made any difference and made an interesting discovery...

    No matter which card I use, the one connected to the 3 monitors is then limited to the 1050 core.
    This led me to trying different overclocks on each card so they are no longer tied together and, low and behold, the other 2 GPU's will run much higher core clocks!!

    So, I made an assumption that since the card running the 3 monitors is also the one getting the hottest, i would await until I got my new loop installed and expected that the lower temps would solve the problem. Sadly, I was wrong.

    My max temps on GPU and VRM's are now 40C and still the same core limit of 1050 applies to any card running the three monitors. :(

    So, my question, you guys out there running in eyefinity with 3 monitors, what OC's are you achieving?

    Thanks in advance for any info your can offer.

    P.S: I realise that my next task is to disconnect 2 monitors and set the software up so its running just the one.
    Last edited: Mar 20, 2012
  2. Xaser04


    May 15, 2007
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    Hi Stu.

    I run Eyefinity but on a single HD7970. Based on your "issue" I don't think this should be a problem for comparisons sake.

    My card will quite happily do 1125/6600 when running Eyefinity at "stock" volts of 1.175. I can push it further but the voltage required takes a big jump so I don't bother.

    I did wonder if running Eyefinity was causing the card to heat up more than normal so tried 1080p and ended up with the same result.

    What are you using to overclock? Are you adjusting powertune at all?
  3. cadaveca

    cadaveca My name is Dave

    Apr 10, 2006
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    Edmonton, Alberta
    Hey Stu, do you have the PCIe power plug on the motherboard plugged in?
  4. t_ski

    t_ski Former Staff

    Apr 11, 2006
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    I have had an Eyefinity setup for quite a while using different cards: 5970, dual 5970's, 6970, dual 6970's and now a 7970. In every scenario in the past (have not checked this on the new card) adding more monitors to a master card raised CPU core temps.

    Not sure if this is your issue, but I'm just adding confirmation that it does raise the temps.
    Crunching for Team TPU

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