GoKawiilOpen-source ReBarUEFI driver adds Resizable BAR support to unsupported motherboards
ReBarUEFI is a UEFI DXE driver that can be injected into a system's firmware to enable Resizable BAR on boards that don't officially support the feature. It works by patching the PCI resource allocation process during boot and is paired with a companion tool, ReBarState, to set the BAR size, with a separate project called NvStrapsReBar covering older NVIDIA Turing GPUs.
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Resizable BAR can improve gaming and GPU performance and is described as required for Intel Arc GPUs to run optimally, so a firmware-level workaround could extend those benefits to older or budget motherboards that manufacturers never updated. Because the tool involves flashing modified firmware and using unsigned modules, it carries risk that mainstream BIOS updates from vendors would not, and users may need to sidestep Secure Boot or BIOS restrictions on their own hardware.
- ReBarUEFI is a DXE driver that patches firmware to enable Resizable BAR on unsupported systems.
- It requires 4G Decoding and works alongside the ReBarState tool to configure BAR size.
- The project maintains a community-sourced list of motherboards confirmed to work with it.
Intel Arc A750 Graphics Card — Since Resizable BAR is essentially required for Intel Arc GPUs to hit their full performance potential, this project pairs perfectly with an Arc A750 card. If you're tinkering with ReBarUEFI to unlock Resizable BAR support on your system, an Arc GPU is the ideal way to actually see the benefits in action.
See Intel Arc A750 Graphics Card on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: github.com, 2026-09-21
Published there as: “ReBarUEFI: Resizable BAR for almost any UEFI system”
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