I hadn't originally planned on putting this out there, but some other asshole decided to charge a fee for this info. Fuck that guy. Here's how you run 4+ Vega at full speed while mining XMR.
Basic Users:
1. Use the Blockchain drivers.
2. Open up your device manager.
3. Open up the "Display Adapters" dropdown.
4. Right click on one of your Vega's.
5. Disable that fucker.
6. Wait a few seconds.
7. Right click on the Vega you just disabled.
8. Re-enable that fucker.
9. Repeat steps 4-8 for the rest of your cards.
10. Enjoy mining at full speed with as many Vega as you damn well please. Probably.
XMR: 42e8AWjcirkBDzCNnSjPxeGJeht71kFfWcoxxCWsxe8HZqP29NruDsxcvVSjbKw17AUDepopK7ZYCUn mRvcGS9kBT5XWhMQ
ETH: 0x74Ed2CA095Dd3aE98D88d5ca1dDb77E752152938
Interesting. I was banging my head against the wall trying to get a third Vega running on an MSI X370 Ryzen build. I noticed that if I went into the Registry and disabled Crossfire and ULPS, the third card would show up, but there were still problems.
Question: the command to launch OverdriveNTool -p0Vega0 -p1Vega1... is that pulling up separately saved profiles for each Vega card and applying them, or something else?
Thanks.