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Resizable BAR (also known as Re-Size BAR, AMD Smart Access Memory (SAM), [3] or ASRock Clever Access Memory (CAM)) [4] is a capability which a PCIe device can use to negotiate a larger BAR size. [5] Classically, BARs were limited to a size of 256MB, but modern graphics cards have framebuffers much larger than that. [ 3 ]