Old platforms get UEFI mod for Resizable BAR support, yielding 6% performance boost on average


February 9, 2024 by our News Team

"ReBarUEFI project enables ResizableBAR feature on older platforms, providing an average 6% performance boost for gaming."

  • Provides a significant performance boost for older systems
  • Allows for the utilization of a previously underutilized feature
  • Offers a clever workaround for activating ReBAR on platforms that don't natively support it


UEFI Resizable Bar Mod: Boosting Gaming Performance on Older Platforms

ResizableBAR, a feature that gained popularity in 2020 with AMD’s Smart Access Memory technology, has now found a way to support older platforms that don’t natively support it. Thanks to the ReBarUEFI open-source project, gamers using aging systems can now enjoy an average 6% performance boost.

Initially, ResizableBAR was an underutilized PCI Express feature present in many motherboards for years. However, it gained widespread attention when AMD introduced SAM. This prompted other GPU vendors to follow suit and implement the feature. Now, the ReBarUEFI project offers a boot-time module that replaces existing functions to enable ReBAR compatibility.

While not universally applicable, the project provides a clever workaround for activating ReBAR on platforms like the Intel Sandy Bridge from 2011. Some platforms may require enabling 4G encoding, but instructions for achieving this can be found on the project’s GitHub page.

Once activated, ReBAR allows for the allocation of more than 256MB of system memory to be mapped to GPU memory. This allocation significantly enhances gaming performance. For example, enabling ReBAR on a Core i3-3470 CPU paired with a Radeon RX 580 GPU could result in up to a 12% performance boost after activating a 2GB BAR size.

It’s important to exercise caution when using mods, especially when tinkering with BIOS settings. But for those looking to breathe new life into their older systems and squeeze out some extra gaming performance, the UEFI Resizable Bar Mod could be a game-changer.

Source: ReBarUEFI, PCGamer, HKEPC

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Background Information


About AMD: AMD, a large player in the semiconductor industry is known for its powerful processors and graphic solutions, AMD has consistently pushed the boundaries of performance, efficiency, and user experience. With a customer-centric approach, the company has cultivated a reputation for delivering high-performance solutions that cater to the needs of gamers, professionals, and general users. AMD's Ryzen series of processors have redefined the landscape of desktop and laptop computing, offering impressive multi-core performance and competitive pricing that has challenged the dominance of its competitors. Complementing its processor expertise, AMD's Radeon graphics cards have also earned accolades for their efficiency and exceptional graphical capabilities, making them a favored choice among gamers and content creators. The company's commitment to innovation and technology continues to shape the client computing landscape, providing users with powerful tools to fuel their digital endeavors.

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About Intel: Intel Corporation, a global technology leader, is for its semiconductor innovations that power computing and communication devices worldwide. As a pioneer in microprocessor technology, Intel has left an indelible mark on the evolution of computing with its processors that drive everything from PCs to data centers and beyond. With a history of advancements, Intel's relentless pursuit of innovation continues to shape the digital landscape, offering solutions that empower businesses and individuals to achieve new levels of productivity and connectivity.

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Technology Explained


CPU: The Central Processing Unit (CPU) is the brain of a computer, responsible for executing instructions and performing calculations. It is the most important component of a computer system, as it is responsible for controlling all other components. CPUs are used in a wide range of applications, from desktop computers to mobile devices, gaming consoles, and even supercomputers. CPUs are used to process data, execute instructions, and control the flow of information within a computer system. They are also used to control the input and output of data, as well as to store and retrieve data from memory. CPUs are essential for the functioning of any computer system, and their applications in the computer industry are vast.


GPU: GPU stands for Graphics Processing Unit and is a specialized type of processor designed to handle graphics-intensive tasks. It is used in the computer industry to render images, videos, and 3D graphics. GPUs are used in gaming consoles, PCs, and mobile devices to provide a smooth and immersive gaming experience. They are also used in the medical field to create 3D models of organs and tissues, and in the automotive industry to create virtual prototypes of cars. GPUs are also used in the field of artificial intelligence to process large amounts of data and create complex models. GPUs are becoming increasingly important in the computer industry as they are able to process large amounts of data quickly and efficiently.


Radeon: AMD Radeon, a product line by Advanced Micro Devices (AMD), consists of graphics processing units (GPUs) recognized for their strong performance in gaming, content creation, and professional applications. Powered by innovative technologies like the RDNA architecture, Radeon GPUs deliver efficient and powerful graphics processing. The brand also supports features like FreeSync, enhancing visual fluidity and reducing screen tearing during gaming. Moreover, AMD Radeon GPUs embrace real-time ray tracing for heightened realism in lighting and reflections. With a balance between price and performance, Radeon competes with NVIDIA's GeForce graphics cards and remains a popular choice for a wide range of users.





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