Dual RTX 3090 System - Where to Buy?

magnitude on 12/03/2021 - 20:36
Last edited 12/03/2021 - 20:43 by 1 other user

Basically I cant be bothered going thru the whole building a PC thing. I have a recentish machine that i build last year (x570 mobo,ryzen 7, 16gb, 1080ti, quality 600W PSU, high end nVME SSDs ) but I don't think I have the energy to source a 3090, get a new case, new PSU, all of that.

I'd rather just buy a prebuild system but the only ones i can find are only one GPU and I am afraid if one GPU isn't enough, then i will be stuck with an unupgradable system. And if im dropping all that money, might as well get one with two GPUs now, because at that point i've already spend more than is reasonable.

The prebuilt 3090 systems ive seen are ok for price (around 6k) but they dont use a mobo that will allow a 2nd 3090 at full speed (x16) .. nor will the psu be sufficient im guessing).

I'm in perth if it matter.

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  Twix on 12/03/2021 - 20:43

  SLI is dead. Why do you want dual GPUs?

  • 

    magnitude on 12/03/2021 - 20:43

    hey, for deep learning!

    • 

      Twix on 12/03/2021 - 20:46

      +1

      Neat!

      There is a GPU shortage going around. I doubt you will find any prebuilds with 1 RTX 3090 let alone 2 RTX 3090.

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        magnitude on 12/03/2021 - 20:47

        that's what i thought but i found them pretty easily, eg center.com seems to have some in stock (if you buy online). but the mobo isn't suitable and i dont see a path to upgrading online.

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          Twix on 12/03/2021 - 20:56

          @magnitude: Looks like they got some new Asus stock. Custom PC link

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            magnitude on 12/03/2021 - 20:57

            @Twix: a little weary of going down the custom path because i dont know which motherboard to go with etc. or what psu will work for a dual 3090. i will try doing the research but it's mostly just forum posts of people who are thinking out aloud rather than what worked well already. plus more than likely those components aren't available here!

            • 

              Twix on 12/03/2021 - 21:06

              +1

              @magnitude: 1200W PSUs are what the deep learning dual RTX 3090 builds are using. Link

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                magnitude on 12/03/2021 - 21:22

                @Twix: thanks! ok looks good for PSU. next for mobo. I found 2 which seem to have 3x x16 lines including but i cant seem to add a ryzen 9 5000 series cpu using hte custom builder. maybe they haven't got them in stock…

                https://www.centrecom.com.au/asrock-x570-taichi-amd-motherbo…

                https://www.centrecom.com.au/msi-meg-x570-ace-amd-motherboar…

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                  Twix on 12/03/2021 - 21:59

                  @magnitude: Yeah they don't have Ryzen 9 CPUs in stock.

    • 

      Switchblade88 on 12/03/2021 - 22:06

      If you're actually doing deep learning, do you need x16 on both GPUs?

      I was figuring it's like crypto mining; you only need x1 for a basic link - correct me if I'm wrong though

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    Zachary on 12/03/2021 - 22:19

    +1

    SLI is dead.

    Well….yes and no….yes in that game developers are now responsible for this rather than nvidia and no because most game devs cant be arsed to implement SLi in their games. But if you play older titles that are SLi certified or modded, then you should be fine……until, …well you get a CPU bottleneck…..

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  garetz on 13/03/2021 - 00:42

  +3

  If you are serious about doing this, you would need to buy 2 systems with a 3090, sell the excess parts yourself, buy a 1500 watt power supply, and find a board yourself that will do sli , as no prebuilt will come with a motherboard like that as it will cost alot more than prebuilt motherboards that are usually included.

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  Caped Baldy on 13/03/2021 - 08:30

  +1

  The main shortages are 3080s. You can buy 3090 with relative ease. So you can buy and build yourself.

  Maybe get in touch with a shop that can build for a modest fee.

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  akbal on 17/04/2021 - 17:16

  @twix Did you end up building it?
  Interested to see the specs and what it cost you in the end

  Otherwise Aftershock can do dual 3090s SLI with custom cooling if your keen to pay for it.