Does this Motherboard Support 3 Way SLI?

P8Z68-V/GEN3


http://www.asus.com/Motherboards/Intel_Socket_1155/P8Z68VGEN3/#specifications


Its says it supports •Quad-GPU SLI and Quad-GPU CrossFireX Support?


Thanks Paul
10 answers Last reply
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  1. It only has 3 PCI-E slots in 8x 8x mode... if you add the 3rd PCI-e slot it gets shared with PCI-e 1 and brings PCI-E slot 3 down to 4x mode....

    I think when they say "quad" they mean 2 cards each with 2 cards "inside" of them... some cards are considered 2 in one... so I'm guessing this is "quad" means to them; because it does NOT have 4 PCI-E slots...

    Just my guess(I may be totally wrong).... I'm sure someone else will be able to clarify further.
  2. Actually see this - In early 2006, NVIDIA revealed its plans for Quad SLI. When the 7900GX2 was originally demonstrated, it was with two such cards in a SLI configuration. This is possible because each GX2 has two extra SLI connectors, separate from the bridges used to link the two GPUs in one unit – one on each PCB, two per GPU, for a total of two links per GPU. When two GX2 graphics cards are installed in a SLI motherboard, these SLI connectors are bridged using two separate SLI bridges. (In such a configuration, if the four PCBs were labeled A, B, C, D from top to bottom, A and C would be linked by an SLI bridge, as would B and D.) This way, four GPUs can contribute to performance. The 7950GX2, sold as an enthusiast-friendly card, omits the external SLI connector on one of its PCBs, meaning that only one SLI bridge is required to run two 7950GX2s in SLI.

    Taken from here - http://en.wikipedia.org/wiki/Scalable_Link_Interface
  3. It appears that is will support 3-way SLI, but the GPU in the 3rd x16 slot x1 speed. Note the fine print at the bottom of the page you referenced.
  4. thanks for your replys guys, it appears that it actually doesnt matter what speeds the GPU's are running eg 16x, 8x, 4x, as in the video the 4x slot handled a single card with 2 GPU with little difference, take a look.


    http://www.youtube.com/watch?v=rSfifE2Domo
  5. COLGeek said:
    It appears that is will support 3-way SLI, but the GPU in the 3rd x16 slot x1 speed. Note the fine print at the bottom of the page you referenced.


    it says the 3 rd PCI is default x1, i assume by default it can be changed, IE to 4x when i card is inserted?
  6. even so... the 3rd slot will run at 1x.... not 4x.... he is showing you the 3rd slot by ITSELF... when you add in PCI-e 1 and 2, it shares their bandwidth and will probably take a big hit going down to 1x. Again, I am not positive.

    He also says at the end "how PCI-E speed affects single card performance".... not SLI 18x 8x 1x...
  7. jdenova007 said:
    even so... the 3rd slot will run at 1x.... not 4x.... he is showing you the 3rd slot by ITSELF... when you add in PCI-e 1 and 2, it shares their bandwidth and will probably take a big hit going down to 1x. Again, I am not positive.

    He also says at the end "how PCI-E speed affects single card performance".... not SLI 18x 8x 1x...

    +1. This is the correct interpretation. Regardless, 3-way is possible and will yield some benefit over 2-way SLI.
  8. COLGeek said:
    +1. This is the correct interpretation. Regardless, 3-way is possible and will yield some benefit over 2-way SLI.


    that one card he was running on the 4x slot had 2 GPUs in it... so they were both running at 2x2x like he says, Im not convinced itd run at 1x... just doesnt sound right
  9. It will run, but just not as "fast" as the other PCIe slots. Essentially, you will be saturating the bus. Really, you can expect more than 100% use of the bus and you will be right there.
  10. Theres an option in the bios to change the last slot to 4x or 1x. In doing so you loose the eSata port and a few USB3.0 ports I believe.
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