I do not know where is that Roy's thread since I think it was in other section, but to save yourself from troubles, pick only one of these 3 boards:
1) Asus Zenith ALPHA (not just Zenith). Solid VRM, Solid VRM cooling, 10GBit, will not support 4xGPUs because of the layout. Probably the best board right now.
2) MSI MEG. Excellent VRM, Solid VRM cooling (doesn't even need it), lacks 10Gbit support, will not support 4xGPUs because of the layout. Also great board, but I put it now second because it lacks onboard 10Gbit.
3) Gigabyte AORUS XTREME. Good enough VRM (better then every other board outside of these 3, but much worse than the two above), not good VRM cooling (requires good case airflow to keep in check). 10Gbit, AND as the only board supports 4x GPU because the layout isn't pushed down due to VRM mosfets..
If you are building a workstation for 2990WX, do not consider even for briefest moment anything else than these three. In fact, those first two will be even capable of supporting Zen2 Threadrippers when they eventually come because of solid power cascade.
For those building 2950/2970WX, you can go for any board, not just those three, but those three are still better choice, and you will not regret investing into the top two (ALPHA and MEG).
If you don't plan to use more than 64GB of memory, you can also wait little bit more and just buy the 16core Ryzen9 potentially. It's not competitor for 2990WX, but it is good competitor for 2950/2970WX.