2015 15" Macbook Pro M370x + [email protected] (Sonnet Breakaway 550 via TB3->TB2 adapter) + macOS10.13.1 // working on one screen only
Writing to confirm another working setup:
- MacBook Pro Retina Mid 2015, 15", 2.5Ghz Intel Core i7, M370X
- macOS High Sierra 10.13.1
- Sonnet Breakaway Box 550
- Sapphire Nitro+ RX580
- Apple Thunderbolt TB3 -> TB2 adapter
- Apple Thunderbolt 2 cable (0.5m)
- External monitor connected via HDMI
The setup works with some flaws. After connecting the egpu High Sierra asks to log out and log back in. The card is recognised as AMD R9 xxx 8 GB which is normal and PCIe Lane Width is x4 (I don't know if that's normal).
- the card properly works on one external display - after changing it to the primary display in System Preferences it properly uses GPU acceleration. Geek Bench 4 OpenCL score is 128682, Unigine Heaven 1920 x 1080 Ultra Settings Score is 671 (26.6 fps). This is not bad considering that the card runs through TB2 connection.
- The DVI out on the card is not working - no signal on the monitor it does not even detect any signal.
- If I connect more that one output on the GPU the MacBook shows black screen on all 3 screens (2 external on GPU and internal display). The only thing I can do then is to restart the laptop. It makes no difference if I first connect the egpu with or without external displays attached. Naturally I hutplug it during normal work and then log out for the egpu to be discovered. However - with more than 1 external display connected - if I try to log back in I get black screens on all monitor and need to restart.
Anyone experienced something similar?
What could be the reason? The TB2 connection? The model of the GPU? The system itself?
I would appreciate any comments.
I just tested the same setup with a different card - ASUS ROG STRIX RX580 8GB 0C - exactly the same problem - no more than one external display can be attached... Any thoughts?
This maybe a recent change with macOS High Sierra. I was able to connected 3 monitors to a GTX 1070 eGPU with nMP in 10.12.6.
thanks for the info. So it's a matter of the OS in Your opinion? I'm running the same GPU on a MacPro - all outputs work flawlessly...
Did you try this setup with macOS 10.13.4 and the PurgeWrangler Script?
Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts