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Can macOS Mojave be installed on a Mac Pro 2009 that has been flashed/upgraded to the 5,1 firmware (Mine already is) with a Metal supported GPU like a AMD RX 580?

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    Untested, but afaik yes. The hurdle was the firmware update to install High Sierra; if you got past that you ought to be good to go, but personally I'm waiting for someone else to actually try it ;) You can test for Metal compatibility using GFXBench Metal, freeware from the App Store. – Tetsujin Jun 8 '18 at 5:54
  • Related - apple.stackexchange.com/questions/327150/… – Tetsujin Jun 8 '18 at 6:02
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    If the GPU supports Metal, it may be possible. – Dev Jun 19 '18 at 21:02
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Yes, got Mojave on my 2009 5,1 flashed with the High Sierra update this morning using the 6/18 Mojave download.

The Apple store wouldn't let me download Mojave directly to my 2009, had to download on another machine (a 10.13 Fusion VM) then create a bootable USB, boot my 2009 from the USB and install from there.

  • I tried to install mojave public beta on flashed 2009 5,1 mac pro with R9 280x. The app store installer did not work saying it needs a metal compatible gpu. Does anyone have a solution? – Ryszard Cetnarski Jun 28 '18 at 15:32
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Yes, per the specifications macOS Mojave runs on a Mac Pro 2010 with a Metal-capable GPU. The software is unaware that your machine is really a 2009, as it only checks the board ID which matches a 5,1 machine. Currently running Beta 5 on my 2009, with an AMD Radeon R9 270X flashed with EFI firmware. Be sure to remove any other GPUs from the machine. I first had an issue then remembered I had my original GT 120 installed. I was required to update my EFI firmware, and it successfully updated to MP51.0089.B00. The firmware update may require a GPU with EFI firmware (gray boot screen.)

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just nervously updated from High Sierra to Mojave on my Mac Pro early 2009 (4,1 flashed to 5,1. - dosdude patch for High Sierra ages ago - then the Mojave boot installer/patcher usb drive method by dosdude just last night..)

it did feel a bit like an impulsive move from what i'd read about compatible systems, i was expecting maybe a complete death of the factory fitted gpu as its not Metal (still using the original nvidia GeForce GT120!), was ready to buy an new gpu.

so theres hope out there, not experienced any major gpu issues other than a lack of transparent dock and a few other minor things, but still does dark mode.

TBH just relieved it actually booted. however i'm ready to go for a new rx560 if needed....

good luck out there anyone searching for answers.

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Interestingly, My Mac Pro 4,1 flashed to a 5,1 had no problem downloading the Beta for Mojave (7/27/18), but will not do the firmware update.

It's not clear to me hw it's failing as my video card is a modern nVidia that doesn't show the great screen at POST.

I think I will try to replace it with the original card and see if I get any more info that way...

Much later I add... using the original card (Radeon 5870) I was able to install the firmware update and then swap in a modern video card.

My nVidia 1060 card still isn't usable, as there aren't web drivers for Mojave yet, my RX 580 works but doesn't provide audio over HDMI, which was flawless in High Sierra.

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    Is there a firmware update that's packaged with Mojave? Also, what GPU do you have? – JMY1000 Jul 28 '18 at 8:02
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    A trick for the update, assuming you get that far [you didn't say where it failed] The instructions say 'Hold the power until the light flashes or it beeps'. Having done this several times now, definitely keep holding after the flashes, the beep will follow a few seconds later, then an auto-reboot [chimes]. Release late in the beep, not the flashes. Also, first decrypt file vault if you have it [you may not be able to re-enable it if you can't see the screen before login] support.apple.com/HT208898 – Tetsujin Sep 29 '18 at 12:45
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My early 2009 4.1 flashed to 5.1 installed the firmware update and installed fine. I hadn't read about Metal GPU requirements, and my GTX 970 didn't work (grey bars at top of safari, etc.)

I switched it for a gtx 680 but it's very flaky. I'm trying to edit video in Final Cut, Premiere and DaVinci Resolve, all of which crash regularly and quite spectacularly.

Going to try an RX 580 next...

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I've to say that installing directly Mojave was not working perfectly for me on my 2009 4.1 flashed to 5.1.

Experiencing some slow and weird behavior. But installing the latest High Sierra and then upgrading to Mojave was the real deal. Everything has been working flawlessly since. I also Bought the RX560 graphics card and it works fine. Hope it helps.

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