What it does is let the CPU directly access the entire GPU frame buffer memory, instead of using the usual 256 MB “dump”. Smart Access Memory / Resizable BAR will not increase memory bandwidth. While this AMD graphic above suggests that Smart Access Memory will widen the memory path (and thus memory bandwidth) between the CPU and GPU, that is not true. In addition, multiple transfers can occur simultaneously, instead of being queued up. Graphics assets can be transferred to graphics memory in full, instead of in pieces. Instead of transferring data when requested by the GPU, the CPU processes and stores the data directly in the graphics memory. ![]() Turning on Resizable BAR or Smart Access Memory greatly expands the size of that data dump, letting the CPU directly access the GPU’s entire frame buffer memory.
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