You should probably link to the source of that paper (where the chart is from) and clarify that it has nothing to do with async compute in D3D12. It actually studies a method of microbenchmarking the memory pipeline of modern GPUs and is very informative by the way, spanning three distinct...
Probably a VRAM issue. Many GTX570s died lately, mine included, starting with minor pixel artifacts and sudden game crashes. Parts of the VRM finally blew up one day and it was over.
Multi-socket systems need cache-coherent protocol interfacing to work together under SMP aware OS. HyperTransport does support such mode and none of the APUs from AMD uses this interface, but only PCI-E for peripheral interconnection.
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