Given that miners try to reduce the GPU's performance while maximizing memory performance may indicate that tweaking GPRs may not yield as much a difference as correcting whatever odd problem Fiji had with utilizing its HBM bandwidth--a problem not specific to mining. Perhaps the occupancy concerns of Ethereum can be elaborated on by those using it. I thought current hardware wasn't that burdened by that consideration for mining.
There's a somewhat blurry die shot if you want to try finding evidence of things like a redistribution of LDS.
My impression of GPU mining, and Ethereum as the main example, is that it does tend towards unpredictable access. It helps make device-local bandwidth important and penalizes or renders useless larger clustering strategies.
My point is that I think it, by design, does not demand capacity sufficient to need paging.
