Resizable BAR is a PCIe feature of modern motherboards, processors, and graphics cards that can improve the performance of compatible games. First introduced by AMD alongside its Radeon 6000 series GPUs, under the Smart Access Memory (SAM) name, it allows the CPU to access a much larger block of the graphics VRAM pool in one go, instead of 256MB chunks. For example, instead of sending or accessing 8GB of data on a graphics card through 32 calls, SAM allows the CPU to do this in a single swoop. This reduces the load when transferring data between the CPU and GPU VRAM, which, in theory, should i