Build Thread 1.0   Hm, as far as I've gathered, if the GPU is accessing the 512MB in question, it has to do so exclusively. So it *will* impact performance significantly at this specifc conditions, because not only is the bandwidth impaired for these 512MB, but also will the memory controller have to switch modes between accessing parts of the other 3.5 GB and these 512MB. But it is hard to construct settings where this pool is accessed exclusively: People testing for this issue specifically