Hidden RISC-V Cores Drive Nvidia GPU Logic

Most users associate RISC-V with open-source development boards or emerging server hardware, not the high-performance graphics cards powering their games and professional workloads. However, Nvidia has quietly integrated thousands of these open-architecture cores into its GPUs since 2018. According to the company, over a billion of these cores were shipped in 2024 alone, serving as the essential management layer for complex graphics processing.

These cores are not part of the shader units that render images. Instead, they function as small, dedicated management processors that handle power distribution, security validation, and driver logic. As reported by XDA Developers, one specific RISC-V core has taken over a significant portion of the work that traditionally required the operating system’s graphics driver, fundamentally changing how these chips communicate with the rest of the computer.

Replacing Proprietary Management Chips

Before adopting RISC-V, Nvidia relied on its own proprietary microcontrollers known as Falcon, or FAst Logic CONtroller. Introduced around 2005, these 32-bit cores were designed for low power consumption and long memory latency rather than raw speed. By 2016, they were embedded in more than 15 different engines on a single chip, managing everything from video decoding to security boot processes. While they served the company well for a decade, their limitations eventually became a bottleneck for modern GPU complexity.

The transition was driven by technical constraints that Falcon could no longer overcome. Nvidia engineers noted that the older cores lacked 64-bit address spaces, a data cache, and the ability to run a real operating system. These deficiencies made it difficult to manage the increasing volume of data and logic required in newer generations of graphics hardware, prompting a search for a more robust alternative.

Why Other Architectures Failed

When Nvidia evaluated alternatives in 2016, it considered licensing cores from major industry players such as Arm, Synopsys, and MIPS. However, internal assessments revealed significant drawbacks in these options. Arm’s Cortex-A53, for instance, failed to meet the strict die area requirements for 16nm processes, while other models like the Cortex-A9 lacked necessary 64-bit addressing capabilities. Synopsys ARC HS similarly struggled with security and addressing constraints.

The decision to move to RISC-V was not merely about finding a larger core, but about gaining architectural flexibility. Unlike the proprietary Falcon or the fixed designs of its competitors, RISC-V allowed Nvidia to customize instruction sets and security features without being bound by external licensing restrictions. This modularity was critical for integrating the cores into the tight spatial constraints of modern GPU dies.

Security Implications for Users

The shift to RISC-V has introduced strict cryptographic verification processes. These cores are cryptographically locked, meaning the GPU firmware will refuse to boot if any tampering is detected. While this enhances hardware security, it limits user control. For instance, Linux users have faced restrictions on modifying clock speeds because the signed firmware only responds to Nvidia-approved configurations. This trade-off prioritizes system stability and security over the flexibility that open-source developers often seek.