Hi everyone!
Using MBP (2019 base model+ internal display + 1080ti EGPU) encountered a problem. Using Microsoft Hybrid system have put a preference for RDR2.exe (and every process which could be associated with because have to launch via epic games launcher) and still egpu is not used in a game. Moreover, in the game setting there is an option to change graphics adapter but for me it's like grey(blured).
Found the same issue on the reddit but there is no solution..
Do you have any ideas?
Macbook Pro 15 2019, Sonnet Breakway 550W + Nvidia Gtx 1080 ti
Update: tried to connect egpu directly to tv (just for a test cause it’s ancient 30ghz 😂) and egpu recognizes rdr but if I try to change expansion to only 1st display (thus making internal display the main one) game closes... anyone knows how to trick it?
Changing adapter inside of the game also causes the crash of the game
Solution found!
Changing Vulkan api ti DirectX 12 in settings!
Macbook Pro 15 2019, Sonnet Breakway 550W + Nvidia Gtx 1080 ti
good to know! I finished it with my PS4 PRO and I will play it soon with my MacBookPro! This game is the state of art!
Undoubtedly but still remains the question of optimization 
Macbook Pro 15 2019, Sonnet Breakway 550W + Nvidia Gtx 1080 ti
I had a similar problem with Forza Horizon 4, where it wouldn't use the eGPU in any way, it would run on the MacBook card only even though I have an external monitor connected to eGPU. I had to disable with device manager the internal cards of the Mac.
Mid-2012 15" Retina MacBook Pro + Akitio Node + AMD RX 580
2012 15" MacBook Pro Retina (GT650M) [3rd,4C,Q] + RX 580 @ 10Gbps-TB1>TB3 (AKiTiO Node) + macOS 10.14.3 & Win10 [build link]
Used to try disabling of internal cards but in this case egpu underperforms so much as it's equal to internal card:)
What about forza, everything is okay. (even using internal display)
Macbook Pro 15 2019, Sonnet Breakway 550W + Nvidia Gtx 1080 ti