Resizable BAR is one of those features that we’ve come to appreciate in recent years because it can give a free performance boost in some games. It’s essentially a PCIe feature that lets the CPU access the GPU’s entire frame buffer at once, rather than in smaller chunks. AMD calls it Smart Access Memory (SAM), but it’s the same underlying technology. To set it up, just enable Above 4G Decoding and Resizable BAR in the BIOS settings, and you’re good to go. Or so I thought.