Wattman is rubbish it's just amd overdrive with a different name :/ trixx and afterburner are much better. Also the memory oc really really helps if you can get 600mhz the that's a nice 20% bump.Noticed that the new Radeon drivers now include Wattman for Fury cards, so decided to try overlocking my Fury Xs. I enabled manual voltage control and noticed that my primary card has a default voltage for the top 3 states of 1.250v! (confirmed with Aida64 too) I take it that's terrible right?
It seems as though that is also the maximum voltage as it won't let me increase it. Managed to get 5% OC on it though, better than nothing! Might try for 550 on the memory.
Either way, they have both been running amazingly well at stock and have not encountered any Crossfire issues at all.