Quote from: fullzero on July 19, 2017, 11:44:13 PM

Quote from: Zucca on July 18, 2017, 07:28:17 PM

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

Have you tried updating the bios on this motherboard?

Yes! I am currently using 7A75v12 (https://www.msi.com/Motherboard/support/Z270-GAMING-PLUS.html)
Does it have to be in a special latency value? It is set by default in 32b. Pcie gen 1 o 2? UEFI o Legacy?
I've tried many permutations, all the same problem.

I've been trying with 4 GPU.
With disabled above 4g memory, only 3 GPUS are detected in most cases (sometimes all of them are able to mine)

I don't have one of these mobos; not sure what bios setting are needed.

Does anyone have one of these mobos and know good bios settings?

Ok, I decided to try with 6 GPUs. The first attempts it got stucked at a black screen.
Then it started to show the debug console of linux and got stucked here: http://imgur.com/a/iDZ1a http://imgur.com/a/FSwHP (this is the final lines of the trace, the first sentence it showed said: "Invalid ROM content"
After that, the main gpu (the only connected on the pcie port closest to the micro) stop emiting image, and I was forced to connect the monitor to the other gpu in order to get image.
Then following attemps it went to the loading screen from ubuntu forever.
And then it started to work "fine" (only 4 gpus recognized)

The OS is only recognized in Legacy boot mode, if I switch to UEFI, it asks me for a booteable device.
I have two identical mobos (MSI Z270 gaming plus), both with the same problem: I cannot enable 4g memory. With your OS it shows the image I posted, and with other ones it only gets stucked in a black screen at logon.

I read a lot of posts in different forums from people with the same problem, and I tried everything and nothing worked. Sad