2013 Mac Pro (FP D700 x2) [3rd,12C,E] + RX 580 x2 @ 16Gbps-TB2>TB3 (AKiTiO Node) + macOS 10.13 [mizar]
Macpro 2013 12cores dual d700
Had succes with dual egpu dual rx580, no display connected , egpu only to accelerate Apple Pro app (I use 90% of the time only Apple pro app) during F.Cut editing all the 4 GPU in the system (2 D700 and 2 Rx 580) are working and helping in the rendering!!!
Dual egpu is possible (for me) on the Mac Pro 2013 only when y connect the second egpu during the boot process, when the Apple logo show up, if not the system won't boot with dual egpu.
Hope my experience can be usefull
I attached some pics
Luxmark results and Brucex test took only 13 sec!!!!
Nice work! I wonder why you have to boot with the eGPU attached. In 10.13, you can hot plug the eGPUs then simply log out to let the kexts load.
Cause I did not know that!!!!
I had many problems with dual egpu with 10.2!!! was the only method plug during the boot
I tried right know yes after log off it works, still cannot do a regular reboot I think with dual egpu
Thanks a lot
You can try connecting both eGPUs to Thunderbolt Bus 0 via Port 5 and 6. Make sure there's no display connected to HDMI port. We found Port 5 and 6 more eGPU-friendly and won't hang the nMP at boot.
Each Thunderbolt Bus in the nMP can handle upto two display devices so the bandwidth is shared. However, in your use case it may not effect much. If your dual RX 580 eGPU setup works nicely via Port 5 & 6, run LuxMark again and see if there's a big difference. My guess is there's very little difference.
I tried to connect to the two egpu in the same bus thunderbolt 0 port 5-6
Reboot still does not work for me with two egpu, I have to disconnect one egpu and boot will be ok
Anyway its not a big deal for me, need only to hotplug the second egpu into the system (10.13 beta 2 update 1), log off and its recognise, thanks to itsage advice.