rx 580 and rx 480 in in mac pro 5,1

Discussion in 'Mac Pro' started by VillasManzanill, Oct 16, 2017.

  1. VillasManzanill macrumors member

    Joined:
    Mar 7, 2012
    #1
    just wanna let you know that i just installed
    1 rx 580 in pci slot 2 and is 2,5 slots wide and
    1 rx 480 in pci slot 1 and is 2 slots wide
    they are both asus strix 8gb 3 fans each in a mac pro 5,1
    i had to remove the plastic cover that is in the metal division between the cpu cage and the pci area
    also i had to put a little toothpick in between the card just to give it enough clearance for the fans to don't touch at all.
    im using just the normal pcie booster so far no crashes

    its a monster setup.
    2 x 3.46ghz xeon
    96gb ram
    double gpu
    not bad

    now i can actually play solitary in extreme mode.
     
  2. devon807 macrumors 6502

    devon807

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    Virginia
    #2
    Nice setup, you should run some benchmarks for some nice numbers.
     
  3. VillasManzanill thread starter macrumors member

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    Mar 7, 2012
    #3
    I ended up returning the RX 480 8gb (i just bought it used, super cheap) because it was making my final cut pro X crash. im not sure if there was something wrong with the GPU or fcpx just can't be completely stable with 2 gpus. having 2 rx 480 580 8gb gave a score in luxmark of 29,555 points. but i bruce X benchmark it was pretty much the same, around 19sec. either with 1 or 2 gpus. how sad.
     
  4. h9826790 macrumors G4

    h9826790

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    Hong Kong
    #4
    FCPX can be very stable with 2 GPUs, in fact, the Mac Pro 6,1 only has dual GPU options, and it's almost a FCPX machine. Also, I ran with dual 7950 for quite a bit of time. It's completely stable and perform very well in FCPX (15s BruceX).

    Too bad that it doesn't work with 480 + 580. I am thinking if dual 580 (or dual 480) can work fine in FCPX. Or it's even that particular Asus Strix card not working well with cMP.
     
  5. VillasManzanill thread starter macrumors member

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    Mar 7, 2012
    #5
    not sure whats the exact problem. im thinking its gotta do more with final cut pro x and high sierra making it unstable. that was my whole reason for having dual gpu. i was thinking bruce x will be muuuuch faster but is not. so im not sure whats up. i already returned it tho. it was a very very tight fit tho with the cards that i had. the rx 580 asus strix its a monster. thats the one i kept.
     
  6. itdk92 macrumors 6502

    itdk92

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    Copenhagen, Denmark
    #6
    Dual RX 580 work fine and with no crasv or problem, including fcpx

    GPUs needs to be paired in macOS for best reliability and performance
     
  7. VillasManzanill thread starter macrumors member

    Joined:
    Mar 7, 2012
    #7
    what you mean they need to be paired in mac os ?

    i had asus strix

    rx 580
    rx 480

    now i only have

    rx 580
     
  8. AndreeOnline macrumors 6502

    AndreeOnline

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    Aug 15, 2014
    Location:
    Zürich
    #8
    You need identical GPUs. Not mix and match.

    RX580 ≠ RX480

    Two of one OR the other would be fine.

    I’m not 100% sure they need to be the same brand and model, but why mix it up? I’d definitely go for identical cards all the way.
     
  9. devon807 macrumors 6502

    devon807

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    #9
    To see performance gains, you would have to use two of the same GPU's
     
  10. VillasManzanill thread starter macrumors member

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    Mar 7, 2012
    #10
    Is that actually proven somewhere ? Maybe it was just a defective rx 480. That’s what I tought.
    I have read that even Mac Pro 6,1 owner are having problems with High Sierra FCPX and crashes
     
  11. AndreeOnline macrumors 6502

    AndreeOnline

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    #11
    You can be the one to prove us wrong by buying two other not identical cards and make it work.

    I would advise against it though. :)
     
  12. VillasManzanill thread starter macrumors member

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    Mar 7, 2012
    #12
    Reason I bought the card is that it was extremely cheap. Aprox 157 usd. Asus strix rx 480 8gb. But I think it was defective since the heat sink had been removed and now because of the crashes. I had a 5770 and my strix 580 and no crashes.
     
  13. AndreeOnline macrumors 6502

    AndreeOnline

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    #13
    Yes, well the Mac itself has no problems with mixed cards of course.

    Other apps might also be able to benefit from dual cards. DaVinci Resolve will use both cards if you check "Use GUI card for acceleration", but performance will be limited by the weaker card—especially the amount of RAM. A 3GB and a 11GB graphics card in Resolve would net you 3GB: the lowest common denominator.

    In terms of FCPX, one can imagine that since the only official dual gfx configurations are those from Apple using identical cards, there might be some optimisations that only kick in when two identical cards are recognised.

    At any rate, we've seen quite a few examples with different cards where it seems apparent that not both cards were used. But this is a pretty old topic now and I don't have any links at hand. It's just something I've filed under "lessons learned", personally.

    EDIT: and we've also seen examples of two identical, non standard cards, working.
     
  14. devon807 macrumors 6502

    devon807

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    #14
    I tried it with an RX 560 and the 5770, no go. BruceX was at 30 ish seconds. Two RX 560's did BruceX in 19seconds.
     
  15. VillasManzanill thread starter macrumors member

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    Mar 7, 2012
    #15
    Hello. Can someone share a a test of double (dual) rx 580 in Final Cut Pro x Bruce x?

    I’m thinking in going dual. (Already have a ASUS strix rx 580 8gb)
    My main use is FCPX.
    So I wanna see if there is real benefits of this or it’s only to brag


    Thanks!
     
  16. VillasManzanill thread starter macrumors member

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    Mar 7, 2012
    #16
    Hello

    Anybody has a Bruce X test of two (dual) rx 580
    I’m interested in buying a second gpu if it’s worth it for FCPX. Thanks!
     
  17. VillasManzanill thread starter macrumors member

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  18. mastermix macrumors member

    mastermix

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    #18
  19. itdk92 macrumors 6502

    itdk92

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    #19
  20. fatespawn macrumors member

    fatespawn

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    Chicagoish
    #20
    I'm about to do the same thing to my Mac Pro. I have an RX480 in another computer that I'm going to swipe and put in my Mac Pro. Does anyone have a link to the power connector that will be required to get this sucker up and running. I still have my stock GT120 and will probably just keep it in there if I ever need a boot screen for some reason. Any links? TIA.
     
  21. h9826790 macrumors G4

    h9826790

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    #21
    Reference RX480? How many connector / pin on the card?
     
  22. fatespawn macrumors member

    fatespawn

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    #22
  23. SneakyTLoD macrumors member

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    #23
    https://www.amazon.com/6-pin-8-pin-Video-Power-Cable/dp/B00PVJ2DNC
     
  24. fatespawn macrumors member

    fatespawn

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    #24
  25. SneakyTLoD macrumors member

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