MP 1,1-5,1 Sapphire rx 580 nitro+ 8GB

[Ljmm1967]

I had a similar issue with an incompatible VBIOS. My card was used and I had to find a bios on techpowerup.com that I would work.

You Mac is hanging when it is trying to switch to the OS provided drivers.

This is why I asked if it ever worked in your Mac. My guess would be you have a used RX580 that was flashed for mining and you need to reinstall the stock VBIOS.

 

[Ljmm1967]

Well I’ve now got a brick for a router and awaiting replacement, so I can patch my os ready for my new graphics card.

 

[Monkeynuts*]

Hi guys,
Ages ago I installed my MSI RX-580 Armor edition GPU, and I remember it having the same issue as I’m posting about now…

Basically, in a nutshell, it was only displaying 7mb when I went to ‘About this Mac’.

I recently bought another Radeon RX 580, but this one has 6x mini display ports on the back and more to my setup/liking.

However, I am now facing the same issue with this new card, and for the life of me I can’t remember what I did to get the original card to display the full 8gb.

Do I need to get it flashed? Is it that this new card isn’t compatible?

Need help.

Thanks guys

 

[tsialex]

Hi guys,
Ages ago I installed my MSI RX-580 Armor edition GPU, and I remember it having the same issue as I’m posting about now…

Basically, in a nutshell, it was only displaying 7mb when I went to ‘About this Mac’.

I recently bought another Radeon RX 580, but this one has 6x mini display ports on the back and more to my setup/liking.

However, I am now facing the same issue with this new card, and for the life of me I can’t remember what I did to get the original card to display the full 8gb.

Do I need to get it flashed? Is it that this new card isn’t compatible?

Need help.

Thanks guys

Two things need to be said here:

First, you can't change GPUs with OCLP, like GTX 680 to RX-580. OCLP removes all the other GPU drivers when you root patch the macOS install.

Second and most important thing for you, I've just noticed that the RX-580 box is for a 2048 SPs RX-580.

The RX 580 2048SPs are not supported by macOS at all, these are in reality RX-570 graphics processors that were factory flashed to be a fake and weak RX 580 for the Chinese market. Apple AMD drivers only support the real RX 580 with 2304 SPs.

To solve this you'll have to find a RX 570 firmware from the same manufacturer that works with the 2048 SPs and flash it to the GPU or replace the GPU with a real RX-580.

 

[Monkeynuts*]

Two things need to be said here:

First, you can't change GPUs with OCLP, like GTX 680 to RX-580. OCLP removes all the other GPU drivers when you root patch the macOS install.

Second and most important thing for you, I've just noticed that the RX-580 box is for a 2048 SPs RX-580.

The RX 580 2048SPs are not supported by macOS at all, these are in reality RX-570 graphics processors that were factory flashed to be a fake and weak RX 580 for the Chinese market. Apple AMD drivers only support the real RX 580 with 2304 SPs.

To solve this you'll have to find a RX 570 firmware from the same manufacturer that works with the 2048 SPs and flash it to the GPU or replace the GPU with a real RX-580.

Jeepers! ~ Just caused myself a whole bunch of needless trouble and a weekend of absolute Mac carnage… Tried putting Sequoia on my Mac Pro as well, and it did not go well…

Hum, glad there are people like yourself around to tell me these things, tsialex.

At least the fake 580 was relatively cheap.

Lesson learned and didn’t get too burned.

Thanks again.

 

[tsialex]

At least the fake 580 was relatively cheap.

Lesson learned and didn’t get too burned.

You can go to TechPowerUp, download all the XFX RX-570 firmwares and flash one by one with a PC with another GPU or integrated graphics. It will be a long and tedious trial and error process, but easy enough to do.

 

[Monkeynuts*]

You can go to TechPowerUp, download all the XFX RX-570 firmwares and flash one by one with a PC with another GPU or integrated graphics. It will be a long and tedious trial and error process, but easy enough to do.

I might just do that. So do you mean that the PC I should use should have a main GPU, and my cheap RX 570 needs to be in a secondary 16x PCIe slot for flashing?

Thanks.

 

[tsialex]

I might just do that. So do you mean that the PC I should use should have a main GPU, and my cheap RX 570 needs to be in a secondary 16x PCIe slot for flashing?

Thanks.

Not necessarily, a PC motherboard with integrated graphics and a PCIe x8/x16 slots works perfectly for this type of job.

You just need another GPU/integrated drivers as a primary graphics for when the flashing process fail. Read this post so you know what to do:

EnableGop: Pre-OpenCore GOP support for EFI-era iMacs and Mac Pros

I very recently solved the same situation you seem to have: 5,1 bootROM with EnableGOP, OCLP, and a (used eBay) Sapphire Pulse RX 580 8GB with dual BIOS switch but no boot picker unless AMD Inject GOP was selected in the advanced OCLP config. There is a method for flashing GPU directly on a...

forums.macrumors.com

Good luck.