I think the main thing about PIM is that it typically doesn't make sense to do compute on the same die as the memory because it would be too slow to be useful (

I think the main thing about PIM is that it typically doesn't make sense to do compute on the same die as the memory because it would be too slow to be useful (you're better off going to the CPU for that). But it can make sense when it's a very simple and repetitive calculation. ie: copy data from one location to another, bulk bitwise ops, etc.