- Updated: January 4, 2026
- 6 min read
Corundum: Open‑Source FPGA NIC Revolutionizes High‑Performance Networking
Corundum is an open‑source, FPGA‑based network interface card (NIC) that delivers up to 100 Gbps of high‑performance, low‑latency networking and in‑network compute capabilities, making it ideal for data‑center, cloud, and edge deployments.
What Is the Corundum Project?
The Corundum FPGA NIC project is a community‑driven, fully open‑source implementation of a network interface card built on modern FPGA platforms. It combines a high‑throughput datapath, native PCIe Gen 3 support, and a rich set of offload features such as checksum calculation, RSS, and IEEE 1588 PTP timestamping. Because the design is released under a permissive license, engineers can customize, extend, or integrate the NIC directly into their own silicon or software stacks without paying royalty fees.
Since its first public release in 2020, Corundum has attracted more than 2,000 stars on GitHub and has become a reference design for anyone looking to prototype high‑speed networking on Xilinx or Intel FPGAs. The project also ships a Linux driver that plugs straight into the kernel networking stack, enabling rapid prototyping and production‑grade performance.
Key Features and Benefits
- Scalable Bandwidth: Supports 10 GbE, 25 GbE, and 100 GbE Ethernet using open‑source MAC/PHY cores.
- Massive Queue Architecture: Over 1,000 transmit, receive, completion, and event queues stored in block RAM or UltraRAM, enabling fine‑grained traffic shaping.
- PCIe Gen 3 DMA Engine: A custom, low‑latency DMA engine that moves packets directly between host memory and the FPGA fabric.
- In‑Network Compute Hooks: Dedicated application BAR and programmable interfaces for custom logic (e.g., packet filtering, encryption, or AI inference).
- Time‑Sensitive Networking: Native IEEE 1588 PTP support and high‑precision TDMA scheduling for deterministic latency.
- Open‑Source Ecosystem: All RTL, driver code, and testbenches are freely available, encouraging community contributions and rapid iteration.
These capabilities translate into tangible benefits for network engineers and architects: lower total cost of ownership, faster time‑to‑market for custom NIC solutions, and the flexibility to embed domain‑specific accelerators directly in the data path.
Technical Specifications & Supported FPGA Boards
Corundum’s reference designs target a wide range of FPGA development kits from both Xilinx and Intel. The table below summarizes the most popular boards and the corresponding Ethernet speeds they support.
| Board (Vendor) | FPGA Family | Supported Speed |
|---|---|---|
| Alpha Data ADM‑PCIE‑9V3 | Xilinx Virtex UltraScale+ XCVU3P | 10 GbE / 25 GbE / 100 GbE |
| Cisco Nexus K35‑S | Xilinx Kintex UltraScale XCKU035 | 10 GbE / 25 GbE |
| BittWare 250‑SoC | Xilinx Zynq UltraScale+ XCZU19EG | 10 GbE / 25 GbE |
| Intel Stratix 10 MX Dev Kit | Intel Stratix 10 MX 2100 | 25 GbE / 100 GbE |
| Xilinx Alveo U280 | Xilinx Virtex UltraScale+ XCU280 | 100 GbE |
The design uses the open‑source 10G/25G MAC and PHY modules from the verilog‑ethernet repository, eliminating extra licensing costs. For 100 GbE, the Xilinx CMAC core with RS‑FEC is employed under a free license.
Use Cases & Industry Relevance
Because Corundum is both a NIC and a programmable compute platform, it fits naturally into several high‑impact scenarios:
- Data‑Center Acceleration: Offload packet parsing, encryption, or telemetry directly on the NIC, reducing CPU load and latency.
- Edge AI Inference: Deploy lightweight neural‑network models in the FPGA fabric for real‑time video analytics or anomaly detection.
- Network Function Virtualization (NFV): Implement virtual switches, firewalls, or load balancers with deterministic performance.
- Research & Prototyping: Academic labs use Corundum to explore new protocols (e.g., RDMA over Converged Ethernet) without building silicon from scratch.
- High‑Frequency Trading: Leverage sub‑microsecond latency and precise TDMA scheduling for time‑critical order routing.
The open nature of the project also encourages integration with emerging AI‑driven platforms. For instance, developers can pair Corundum’s in‑network compute hooks with AI marketing agents to perform real‑time content personalization at the edge of the network.
Where to Find the Source Code
All hardware description files, driver source, and testbenches are hosted on GitHub. You can clone the repository, explore the documentation, and start building your own NIC in minutes:
How UBOS Can Accelerate Your Corundum Deployments
While Corundum provides the low‑level hardware foundation, UBOS offers a suite of cloud‑native tools that streamline the development, deployment, and management of AI‑enhanced networking solutions.
Rapid Prototyping with the Web app editor on UBOS
Drag‑and‑drop UI components to build a management console for your NIC, connect directly to the FPGA’s PCIe BAR, and visualize queue statistics in real time.
Workflow automation studio for CI/CD
Automate synthesis, bitstream generation, and regression testing with pre‑built pipelines, ensuring each firmware iteration meets performance targets.
For startups looking to commercialize a Corundum‑based product, the UBOS for startups program provides discounted compute credits, dedicated support, and go‑to‑market resources.
Small‑to‑medium businesses can leverage UBOS solutions for SMBs to host their NIC management dashboards in a secure, multi‑tenant environment without maintaining on‑prem hardware.
Large enterprises benefit from the Enterprise AI platform by UBOS, which integrates with existing data‑center orchestration tools and provides role‑based access control for NIC configuration.
Need a quick start? Explore the UBOS templates for quick start that include pre‑configured dashboards, alerting rules, and API wrappers for the Corundum driver.
To see real‑world implementations, browse the UBOS portfolio examples, where several customers showcase high‑performance networking use cases built on open‑source NICs.
If you are evaluating cost, the UBOS pricing plans are transparent and scale with usage, making it easy to budget for both prototype and production phases.
Finally, consider joining the UBOS partner program to co‑market your Corundum‑based solutions and gain access to joint‑sales opportunities.
Conclusion & Call to Action
The Corundum open‑source FPGA NIC bridges the gap between raw hardware performance and flexible, software‑defined networking. By pairing it with UBOS’s cloud‑native development stack, engineers can accelerate time‑to‑value, reduce operational overhead, and unlock new AI‑driven networking services.
Ready to prototype your own 100 Gbps NIC or embed custom AI inference directly in the data path? Visit the UBOS homepage to explore the full ecosystem, or jump straight to the About UBOS page to learn how our team supports open‑source hardware initiatives.
Start building today, contribute back to the community, and stay ahead of the networking curve with Corundum and UBOS.