Quote from: mraug on August 05, 2017, 12:23:08 AM

Quote from: fullzero on July 18, 2017, 05:19:56 PM

Quote from: Zucca on July 18, 2017, 02:03:54 AM

I tried again a MSI Z270 gamining PLUS, only one gpu connected to the monitor, disabled avobe 4g memory, and it worked.
If I enable 4g, the screen gets like this http://imgur.com/a/w8sSc . Dont even reach grub.
I tried in UEFI and Legacy, and PCI gen 1 and 2.

Have you tried updating the bios on this motherboard?

Hi,

Got the same problem here.

I'm using MSI Z270-A PRO, when I enable above 4g memory in BIOS, I get that broken screen as in the link posted by Zucca. All my GPUs are Saphire RX 580.

Interesting enough, I used the same board with nvOC and 6x1080ti and did not have the problem. I'm using the latest BIOS.

Also another problem only in rxOC is that the Ubuntu doesn't recognize the network adapter on the mainboard. Worked fine on nvOC, only broken on rx0C. Any ideas?

Hello,
The causes can be many, it is really hard to tell, I wasnt able solve the problem with this OS so I moved to Windows.
From the experience I have, a main diferrence between Windows and Linux is the driver, when linux amd driver cannot load a GPU, it fails and stops booting, Windows, in contrast, boots anyway and it hits you with a error message in the device manager o simply doesnt recognize the card.
I know that the main cause of blank screen when enabling 4G, is due to the amd driver not working properly.
What I think it could happened to me, some risers worked unstably and caused driver failures.
When you try to solve mining related issues, you have to make sure that the risers are working, otherwise you will get some errors that will be problematic to identify.
Probably nvidia drivers work different to amd.

@Edit: This guide should help you, https://drive.google.com/file/d/0B-Z98LONNR0hTGM0Y0ViR0VXS2c/view