I thought the cap was 850 but I'm guessing it's only for mythic plus dungeons (which is crap in my opinion). Maybe to gate a bit the gear progression... I was watching alkaizer doing mythic 3+ last night and all the gear was capped at 850 (they could have at least cap it at HC level raids, lets say mythic 5+ = 865 ilvl). Meanwhile I was checking people and came across this:
Meaning it's worth running even normal for that sweet titanforge %.
Also can anybody confirm if bonus rollls can roll WF/Titanforge ?