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mrakar, I cannot answer most of your questions but suggest you contact AMD directly via an Online Support Request, this is a user forum and most here do not work for AMD (I don't). Your Ryzen Master is DL (1.4+ is available), but for some reason it does not run if SVM is Enabled. Here is an image of the paths in the 2990WX:
Notice the dark areas on the upper right and lower left chips. These have no connection to memory and data takes a double hope and no direct connection to PCIe. Not much help. Enjoy, John.