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Two nvidia card on a crossfire mobo?

Da_green1977_aa156fc426Da_green1977_aa156fc426 Posts: 45
in Technical Help (nuts n bolts)

Hello all,

I just buy a rtx2080ti to replace my gtx1080ti. 

If i want to use both cards will that be possible on a motherboard that only support crossfire?

BR // Daniel

Comments

  • magog_a4eb71abmagog_a4eb71ab Posts: 769

    I could be wrong, but I'm pretty sure crossfire/SLI is irrelevant for Iray rendering. As a matter of fact, you shouldn't have multiple video cards running in SLI for Iray rendering. SLI should be disabled. As long as you have the necessary PCIE slots, sufficient power supply(800W-1000W depending on your system), and the motherboard supports it, you should be able to use both cards. Just don't have them running in SLI.

  • Da_green1977_aa156fc426Da_green1977_aa156fc426 Posts: 45

    Thanks for the answer.

    No, i understand that i can’t use sli. But as you said, i shouldn’t anyway.

    Just worried that it wont work anyway since the motherboard say just crossfire....

    BR // Daniel

  • magog_a4eb71abmagog_a4eb71ab Posts: 769

    Chances are that you might not be able to use SLI with NVidia cards on an AMD board that is Crossfire-only. Crossfire and SLI are different. I don't know about the newer AMD motherboards, but the older ones were unable to use SLI. Anyway, like I said, its not something to worry about in regards to rendering.

  • KitsumoKitsumo Posts: 1,216

    They will work. I had an AMD Crossfire ceritified motherboard a few years ago and I used my GTX 770 and 460 just fine. As long as your motherboard has a slot the card can fit into, the card should work. The Crossfire feature won't interfere with your cards.  The main thing is having enough room to add the cards and having enough power connectors for them.

  • kenshaw011267kenshaw011267 Posts: 3,805

    Crossfire certification doesn't preclude using Nvidia cards. All Bx50 and Xx70 Mobo's are crossfire cert, AMD requires it on those, and I'm running two Nvidia cards on mine right now. 

  • JamesJABJamesJAB Posts: 1,760

    pci-e slots are pci-e slots...
    For our rendering usage both corssfire and sli are not used.  All you need is a motherboard that has one pci-e slot for each GPU and a powerfull enough PSU to power your entire system.

  • Da_green1977_aa156fc426Da_green1977_aa156fc426 Posts: 45
    edited April 2019

    Thanks all,

    I ordered this card https://www.asus.com/Motherboards/PRIME-Z370M-PLUS-II/

    Today i have 16gb ddr4. Will 32gb speed up a ”normal scene” with 2 G8 charters when render?

     

    BR // Daniel

    Post edited by Da_green1977_aa156fc426 on
  • KitsumoKitsumo Posts: 1,216
    edited April 2019
    More ram won't speed up your render, it just allows you to render bigger scenes. 32Gb is a good match for an 11Gb card. I have 16Gb and I run out of ram pretty often.
    Post edited by Kitsumo on
  • kenshaw011267kenshaw011267 Posts: 3,805
    Da_green1977_aa156fc426 said:

    Thanks all,

    I ordered this card https://www.asus.com/Motherboards/PRIME-Z370M-PLUS-II/

    Today i have 16gb ddr4. Will 32gb speed up a ”normal scene” with 2 G8 charters when render?

     

    BR // Daniel

    As previously stated system RAM doesn't affect render speed as long as the render stays on the GPU's. With both a 2080ti and 1080ti in the same system 32 Gb is probably the minimum you'll need to load an 11Gb scene onto the GPU's.

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