pastrychef's Asus ROG Strix Z370-G Gaming (WI-FI AC) build w/ i9-9900K + AMD 6600 XT

[RickD00]

Have you tried connecting monitors to just one video card?

There are not enough users with dual video cards who post findings for me to know much about these setups... I can only guess what will work...

The newest EFI allows for easy swapping of video cards because WhateverGreen consolidated the functions of NvidiaGraphicsFixup and IntelGraphicsFixup, but, again, I don't know how it affects multi video card setups.

Connect with only 1 video card works fine.
Even 2 video cards installed on machine, the output from 1st cards works fine but 2nd not.

 

[pastrychef]

Connect with only 1 video card works fine.
Even 2 video cards installed on machine, the output from 1st cards works fine but 2nd not.

That's how I would use it... Have two monitors connected to primary video card and only have second card installed for the benefit of additional GPGPU power.

 

[ChaosMonkey]

@pastrychef @dasx001 I am using two 27" 4k Dell U2718Q monitors connected with 'high grade 4k compatible' DP-DP cables.
I have reinstalled the machine with fresh OS, dropped there untouched 4.1 EFI folder (added my serial, board numbers, etc.) and it boots and starts just fine. It goes to sleep a bit slowly (it takes anywhere from 30s to 60s) then reacts to mouse or keyboard to wake up, but never wakes up properly: fans are spinning, but neither monitor displays anything, I can't SSH into the machine, remote desktop doesn't work, it doesn't respond to a ping.

I'm completely lost here, as this is minutes fresh High Sierra installation with @pastrychef EFI and if the sleep doesn't work, then the whole machine isn't very usable...

 

[RickD00]

That's how I would use it... Have two monitors connected to primary video card and only have second card installed for the benefit of additional GPGPU power.

However I have 5 monitors but one card only support 4 monitors.

Besides, as you mentioned GPGPU...
Do u use ur setup for high performance computing ?
Such as CUDA, OpenCL etc.
Thanks!

 

[pastrychef]

@pastrychef @dasx001 I am using two 27" 4k Dell U2718Q monitors connected with 'high grade 4k compatible' DP-DP cables.
I have reinstalled the machine with fresh OS, dropped there untouched 4.1 EFI folder (added my serial, board numbers, etc.) and it boots and starts just fine. It goes to sleep a bit slowly (it takes anywhere from 30s to 60s) then reacts to mouse or keyboard to wake up, but never wakes up properly: fans are spinning, but neither monitor displays anything, I can't SSH into the machine, remote desktop doesn't work, it doesn't respond to a ping.

I'm completely lost here, as this is minutes fresh High Sierra installation with @pastrychef EFI and if the sleep doesn't work, then the whole machine isn't very usable...

How is sleep/wake with one monitor?

I took a quick look at this thread where two Dell 4K monitors are used. Looks like he has IGPU disabled. You may want to consult him on dual monitor setups. I don't have two monitors to try.

 

[pastrychef]

However I have 5 monitors but one card only support 4 monitors.

Besides, as you mentioned GPGPU...
Do u use ur setup for high performance computing ?
Such as CUDA, OpenCL etc.
Thanks!

Ah... I forgot that you are using 5 monitors. I really don't know what needs to be done to activate the video ports on the second card correctly...

No, I don't run any apps that really utilize OpenCL. I'm on a Vega so no Cuda for me. Metal, of course, is is used even in Finder.

 

[aussiepilot]

@pastrychef @dasx001 I am using two 27" 4k Dell U2718Q monitors connected with 'high grade 4k compatible' DP-DP cables.
I have reinstalled the machine with fresh OS, dropped there untouched 4.1 EFI folder (added my serial, board numbers, etc.) and it boots and starts just fine. It goes to sleep a bit slowly (it takes anywhere from 30s to 60s) then reacts to mouse or keyboard to wake up, but never wakes up properly: fans are spinning, but neither monitor displays anything, I can't SSH into the machine, remote desktop doesn't work, it doesn't respond to a ping.

I'm completely lost here, as this is minutes fresh High Sierra installation with @pastrychef EFI and if the sleep doesn't work, then the whole machine isn't very usable...

Same problem with RX580 GPU and 2 monitors, however, as I never use sleep, it's not a big deal for me.

I do occasionally have the 2nd monitor start in a funny way though - it's rotated 90 degrees and on start, it's rendered as if portrait, but not actually rotated. I have to unplug and re-plug the DP cable to it to resolve. This has just started happening with the 17G2112 EFI folder, so I guess it's an issue with the WhateverGreen version, so may be resolved with the new one coming.

 

[pastrychef]

Same problem with RX580 GPU and 2 monitors, however, as I never use sleep, it's not a big deal for me.

I do occasionally have the 2nd monitor start in a funny way though - it's rotated 90 degrees and on start, it's rendered as if portrait, but not actually rotated. I have to unplug and re-plug the DP cable to it to resolve. This has just started happening with the 17G2112 EFI folder, so I guess it's an issue with the WhateverGreen version, so may be resolved with the new one coming.

So sleep is broken with two monitors and works with one monitor?

 

[odendahl]

Alright,
Also found everything in BIOS. Don’t really know why I didn’t see it previously...

The reason you didn't see this in the BIOS is because of a bug in BIOS 1002. There is a bug that hides the entries "RC6(Render Standby)" and "DVMT Pre-Allocated" if you change "iGPU Multi-Monitor" from Disabled to Enabled. You then need to reboot once, and then the two missing entries show up.

 

[NelsonPJ]

The reason you didn't see this in the BIOS is because of a bug in BIOS 1002. There is a bug that hides the entries "RC6(Render Standby)" and "DVMT Pre-Allocated" if you change "iGPU Multi-Monitor" from Disabled to Enabled. You then need to reboot once, and then the two missing entries show up.

I can confirm this - I saw the same behavior after flashing BIOS 1002 and following PastryChef's recommended BIOS settings.