so I have process hacker 2 open, I can account for maybe 4-5gb of vram usage, however vram is apparently using 10gb, I have no idea what’s eating all of it and would like to find out because I have issues when too much is used with system stability.
is there any better way to be able to see what’s eating vram? or a good way to flush it that’s not a restart?
metadata is always stored in ARC. So if you got the RAM or L2ARC, special vdev isn’t necessary. But this can be evicted on pressure. special is stable storage. It’s a question of philosophy if you want metadata in fast RAM or slow(er) storage
Looks like a meaningful response to a different thread. 
Process Explorer shows GPU memory usage per process.
The key combination Win + Ctrl + Shift + B will restart GPU drivers without a restart but any allocated VRAM will likely be immediately re-allocated.
That seems high. How many monitors are hanging off this GPU and what resolutions are they running?