W1zzard What is new here is that apparently the gpu has some concept of virtual memory, like your cpu does. Think pagefile. This is completely transparent to the application.. Memory pages will be paged out automatically when memory get low, probably based on some recently used algorithm. When a page fault is generated by the gpu, the relevant pages are paged in by the gpu, automagically, but with higher latency.

So, in an essence, AMD has expanded the cache hierarchy. We have L1 and L2 on GPU itself, L3 is basically VRAM (I'm not aware of L3 being used on GPU's unlike with CPU's or is it?) and now they've added L4 which is system RAM. All this is usually controlled by algorithm/prediction based prefetchers.I mean, if this will be fully automatic without any need for special game code, it's gonna be nice and it's going to dramatically expand the usability of the graphic card over time as it ages and new demanding games come out with more memory needed to work. Sure it won't be as fast as having as much VRAm available at all times, but it won't be nearly as bad as running out of VRAM entirely. I know Win8/Win10 already does this to small extent, but I don't think not even nearly in such extent as VEGA will be doing it this.I mean, with Vega, my 32GB of system RAM will finally find a very good use. Because for games, not even 16GB is really needed. Meaning other 16GB is idling to itself most of the time. But Vega will be able to use that. I like the idea very much.