A new DXE driver, NV_30_DXE, has been developed to enable Resizable BAR (ReBAR) on specific NVIDIA RTX 3080 graphics cards that were previously limited by their VBIOS. This driver modifies the motherboard BIOS to override the frame-buffer size and resize BAR1 to 32 GiB, allowing for significantly increased VRAM mapping by the CPU. The modification has been tested on an MSI Z690 EDGE with Windows 11 and driver 617.42, confirming that ReBAR is enabled and survives sleep/wake cycles and PCI Function Level Resets. The unlocked cards show substantial gains in FP16 and BF16 performance, nearly doubling TFLOPS compared to the locked state. AI
IMPACT Enables higher VRAM utilization for AI workloads on specific GPUs, potentially improving performance in memory-intensive tasks.
RANK_REASON This is a user-developed tool that modifies existing hardware for improved performance, rather than a direct release from a hardware manufacturer or a significant industry-wide development.
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