Awesome it's not just me. I have the same issue's that I get 1 installed fine anything after that it's a 50/50 chance that the driver installs correctly for the other 9 Vega gpu's. I haven't tried another driver yet besides the Aug23 blockchain driver. Have you? Trying to compare notes to see what else to test to try and get them hashing. I've spent WAY to much time on get more that 1 Vega GPU working...
I'm running 2x Vega FE. The public drivers I've run are Vega FE release drivers, Vega FE beta(public) and the aug. 23 block chain drivers.
I got both cards up to 42.4Mh/s last night. Windows updated and restarted the computer and I can't get them past 36mh/s now. Very frustrating.
(edit) speed for 8 RX vega is 319/MHs and 10AMPS
Well FUCK this but her ya go found the fix to this... Get Windows installed and install team viewer from there and install drivers from there. Only install 8 GPU's more than that it will CRASH on you when you do the driver install. Don't be afraid to reboot the system while the driver install isn't going on a you can't connect via team viewer. Also apply claymore clocks and mem clocks first then use overdriveN about 1min after to fix the clock speeds.
https://imgur.com/a/CkRan
regards,
tharp