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X58 SLI LE with Tri-fire 6950s? Is this possible with the PCI-E lanes?

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Cubemonkey
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2011/09/20 13:02:40 (permalink)
Since it appears that the HD7000 cards were pushed to 2012, I'm going to pick up three 6950s to replace my 5870.
 
Is three doable with the LE's PCI-E lanes? I can't seem to find out how much bandwidth they can utilize. Any help is appreciated.

MOBO: EVGA SLI X58 LE
CPU: Intel Core i7 920 D0
COOLER: Xigmatek Dark Knight w/ 104CFM Panaflo
RAM: 6GB DDR3 1600mhz OCZ Gold
GPU: XFX 5870 
CASE: HAF X Blue
PSU: Corsair AX850
HDD: 1TB WD Caviar Black
OS: W7 Home Premium
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    KMoore4318
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    Re:X58 SLI LE with Tri-fire 6950s? Is this possible with the PCI-E lanes? 2011/09/20 13:25:05 (permalink)
    Your lanes are locked at  at x16-x8-x4-x8 ; the 759 or 762 would be your best boards, they have the nf200 chips, so 3X16X or 4X16X would be do-able. ATI cards can utalize more bandwidth than a nvidia card, But run at a slower speed. so you would see more loss that the typical 2-3% you would see with nvidia cards going from 16X to 8X, but you would still get more performance that just running two. Going the 590 route would allow 4 gpu's at 16X, as they have built in nf200 chips, but since you only have 1 16X lane, you would only be able to run one card at 16X and one at 8X.  

      
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    Cubemonkey
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    Re:X58 SLI LE with Tri-fire 6950s? Is this possible with the PCI-E lanes? 2011/09/20 13:46:01 (permalink)
    So I could do 16/8/8 with my board, eh?
     
    To confirm, the slots would be as follows:
     


    MOBO: EVGA SLI X58 LE
    CPU: Intel Core i7 920 D0
    COOLER: Xigmatek Dark Knight w/ 104CFM Panaflo
    RAM: 6GB DDR3 1600mhz OCZ Gold
    GPU: XFX 5870 
    CASE: HAF X Blue
    PSU: Corsair AX850
    HDD: 1TB WD Caviar Black
    OS: W7 Home Premium
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    KMoore4318
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    Re:X58 SLI LE with Tri-fire 6950s? Is this possible with the PCI-E lanes? 2011/09/20 17:39:45 (permalink)
    YES

     
    But I would put a power boost in the unused 4X

      
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    Cubemonkey
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    Re:X58 SLI LE with Tri-fire 6950s? Is this possible with the PCI-E lanes? 2011/09/21 06:06:03 (permalink)
    Thanks for the confirmation.
     
    Regarding the power, between the 75W from the lane, and 2x75W from two 6-pin connectors, shouldn't there be enough juice for each 158W-eating card?
     
    I guess I'm a little uncertain as to the usefulness of the power boost, but I never considered putting this many GPUs on the board when I got it. I'm waiting for LGA 2011 but want to run these cards for BF3/Skyrim/et al.

    MOBO: EVGA SLI X58 LE
    CPU: Intel Core i7 920 D0
    COOLER: Xigmatek Dark Knight w/ 104CFM Panaflo
    RAM: 6GB DDR3 1600mhz OCZ Gold
    GPU: XFX 5870 
    CASE: HAF X Blue
    PSU: Corsair AX850
    HDD: 1TB WD Caviar Black
    OS: W7 Home Premium
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    KMoore4318
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    Re:X58 SLI LE with Tri-fire 6950s? Is this possible with the PCI-E lanes? 2011/09/21 06:22:31 (permalink)
    Cubemonkey

    Thanks for the confirmation.

    Regarding the power, between the 75W from the lane, and 2x75W from two 6-pin connectors, shouldn't there be enough juice for each 158W-eating card?

    I guess I'm a little uncertain as to the usefulness of the power boost, but I never considered putting this many GPUs on the board when I got it. I'm waiting for LGA 2011 but want to run these cards for BF3/Skyrim/et al.


    I am realy better at talking about the power on Nvidia cards than The other guys, but I wouldn't go with anything 480 or above without the power boost, or a suplamental power port. for about $10 plus shipping, it's just not worth not having it. Perhaps someone else will chime in with more experiance with ATI power usage.

      
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    1)965 V-8  E761(77)
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    3) E770 (77)2(590) SLI AX1200 
    4) X299 FTW K, 9980XE 2 2080 supers on AX1200
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    Cubemonkey
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    Re:X58 SLI LE with Tri-fire 6950s? Is this possible with the PCI-E lanes? 2011/09/21 06:39:53 (permalink)
    KMoore4318

    Cubemonkey

    Thanks for the confirmation.

    Regarding the power, between the 75W from the lane, and 2x75W from two 6-pin connectors, shouldn't there be enough juice for each 158W-eating card?

    I guess I'm a little uncertain as to the usefulness of the power boost, but I never considered putting this many GPUs on the board when I got it. I'm waiting for LGA 2011 but want to run these cards for BF3/Skyrim/et al.


    I am realy better at talking about the power on Nvidia cards than The other guys, but I wouldn't go with anything 480 or above without the power boost, or a suplamental power port. for about $10 plus shipping, it's just not worth not having it. Perhaps someone else will chime in with more experiance with ATI power usage.

     
    Ah, well the GTX 480 has a 250W TDP, which is about 90W higher than the 6950s. In that case, I think I'll be ok. Thanks, though.

    MOBO: EVGA SLI X58 LE
    CPU: Intel Core i7 920 D0
    COOLER: Xigmatek Dark Knight w/ 104CFM Panaflo
    RAM: 6GB DDR3 1600mhz OCZ Gold
    GPU: XFX 5870 
    CASE: HAF X Blue
    PSU: Corsair AX850
    HDD: 1TB WD Caviar Black
    OS: W7 Home Premium
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