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790i Ultra, 16GB RAM cannot take 2 video cards

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chronos432
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Sunday, March 04, 2012 5:59 PM (permalink)
Hi all! 
  
I managed to get 4 x 4GB of G. Skill Ripjaws 1600 at 9-9-9-24 2T with 1.525V running, but with a caveat - I cannot run two video cards with this configuration. I have two GTX260s in SLI but with both video cards in and a Areca 1280ML in the middle PCIe slot, the board will not boot with 16GB memory on tap. Remove one of the GTX260s and no problems.  
 
I thought it might be a power issue - I have a 750W PC Power&Cooling Silencer, but when I detached all my harddrives (have 6) to save power, still no successful post - it goes into endless reboot loop. 
  
Any ideas? I might have to move to a single GTX570 or so. 
This is running with a E8500 at 3.6-3.8Ghz (stock clocks have no change in ability to boot). I'll post voltage and timing values when I get home.
 
Thanks! 
Yeang 

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    VistaHead
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    Re:790i Ultra, 16GB RAM cannot take 2 video cards Sunday, March 04, 2012 6:06 PM (permalink)
    The problem is that you have too much of a draw on your SPP chip.  The SPP controls both video cards in SLI, the memory controller, and a few other items.  Try increasing the voltage, as long as you are still within the recommended "safe" voltage settings.
    #2
    chronos432
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    Re:790i Ultra, 16GB RAM cannot take 2 video cards Sunday, March 04, 2012 6:31 PM (permalink)
    Hi Vistahead!
     
    Awesome! that was exactly what I was hoping to find out. I suspected something might have been off but wasn't sure what. Will try this as soon as I get home!
     
    Thanks so much.
    Yeang
    #3
    feniks
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    Re:790i Ultra, 16GB RAM cannot take 2 video cards Monday, March 19, 2012 8:02 PM (permalink)
    You can max it out to the last red setting. I used to run SPP daily at 1.50V on my former 790 Ultra for a few years with no problems (with Q9450 @ 3.6GHz, memory linked/synced).
     
    while benching at max stable CPU & MEM & GPU clocks I was using max 1.55V with no adverse effects either

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    wipout
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    Re:790i Ultra, 16GB RAM cannot take 2 video cards Tuesday, April 24, 2012 12:04 AM (permalink)
    <bump> Hi Chronos,
     
    I too have the same issue...
     
    did you try the SPP voltage? I am curious to see if this worked for you?
    I miss my SLI
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