Yeah I get it but the Task Manager from Windows is not a reliable tool to actually measure things and as I said before the error you're having is about your GPU, it's litterally wrote in it.my gpu isn't the issue, I look at my task manager and when I run it I see that my memory gets used all the way to 100 and then my game crashes giving that error. I can play build 81 with max graphics and it doesn't crash for me lol. build 81 uses 60 percent of my ram. on 86 even at the lowest settings the game still crashes for me do to memory utilization.
I'm also playing with 16GB of RAM as you do and the game runs perfectly well on the Build 84 and no, my RAM is not at 100%, not even close.
Try the solutions I gave you above or just wait for a patch.