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?