IN Brief:
- BigSky SF-2U870 is a 2U server containing 32 SiFive P870-D cores operating at 2GHz.
- The system includes 256GB DDR5-5600, 64 PCIe 5.0 lanes, NVMe storage, and 10/25Gb networking.
- Ubuntu 26.04 LTS and RHEL 10 are supported, while CUDA is already running on the platform.
SiFive has launched a rackable RISC-V development server designed to give hyperscalers, software companies, and silicon developers a physical platform for datacentre software porting and workload validation before custom production hardware is available.
The BigSky SF-2U870 is a 2U system containing 32 SiFive P870-D processor cores running at 2GHz. It includes 256GB of DDR5-5600 memory, four PCIe 5.0 x16 interfaces providing 64 Gen5 lanes, a further PCIe 3.0 x4 connection, a 3.84TB U.2 NVMe SSD, and a 10/25Gb OCP 3.0 network interface.
The chassis can also accept a double-width x16 GPU. SiFive is using that capability to place RISC-V processors alongside established accelerator hardware rather than positioning BigSky as a CPU-only evaluation board.
Lead customers are already running workloads on deployed systems, according to the company. Production is currently limited and SiFive says demand is exceeding available supply, making the platform a development vehicle rather than a conventional volume server product.
Software support is central to the announcement. BigSky complies with the RVA23 application-processor profile and runs Canonical Ubuntu 26.04 LTS and Red Hat Enterprise Linux 10, giving software teams a defined architectural baseline rather than another proprietary RISC-V implementation requiring its own operating-system assumptions.
SiFive has also demonstrated CUDA running on the P870-D platform as part of its collaboration with Nvidia. The server can operate as a head node for large-language-model workloads executed on Nvidia GPUs, allowing CPU-side software to run on RISC-V while acceleration remains on established GPU hardware.
That is an important distinction from simply showing that a RISC-V core can boot Linux. Datacentre adoption depends on compilers, operating systems, libraries, drivers, orchestration software, networking, storage, management tools, databases, and applications working together under sustained workloads.
A rackable server gives developers a more realistic environment for finding those problems than an FPGA prototype or small evaluation board. Engineers can connect standard storage and networking hardware, install enterprise Linux distributions, attach accelerators, and exercise software using a physical form factor closer to future deployment.
The RVA23 profile also helps constrain the portability problem. RISC-V allows implementations to select from a large set of standard extensions, but that flexibility can become awkward for operating-system and application developers if different processors expose incompatible combinations of features.
A profile establishes a common baseline for application-class processors. Software can then target that baseline rather than probe endlessly for architecture differences, while processor suppliers remain free to add implementation-specific features above it.
BigSky’s hardware specifications put it firmly above the development boards historically associated with RISC-V. The 32-core configuration, DDR5 capacity, PCIe Gen5 connectivity, NVMe storage, high-speed networking, and GPU slot are intended to support actual server-class workload development rather than embedded experimentation.
SiFive is simultaneously working with Nvidia to integrate NVLink Fusion into future datacentre-class solutions. BigSky does not itself represent the finished NVLink architecture, but running CUDA on the current server gives developers a route to begin software enablement while later processor and interconnect designs remain under development.
This sequencing matters because software readiness can otherwise trail silicon by months or years. A custom SoC customer that receives first silicon before its operating systems, libraries, drivers, and applications have been ported wastes expensive hardware-development time solving problems that could have been exposed earlier.
SiFive’s business model is based on processor intellectual property rather than competing primarily as a merchant server-CPU supplier. BigSky therefore acts as an enablement platform for customers considering their own RISC-V datacentre silicon, giving them an environment in which to tune workloads before finalising a processor implementation.
The barriers to broader RISC-V datacentre adoption remain substantial. Enterprise buyers expect long support cycles, predictable platform management, mature virtualisation, peripheral compatibility, security maintenance, performance tooling, and a large body of certified commercial software.
BigSky does not remove those requirements. Its value is more practical: RISC-V developers now have a standard 2U machine on which the missing pieces can be found under real workloads instead of being discovered only after a custom chip has returned from fabrication.
