Specifications
Model
SiFive BigSky SF-2U870
Product Type
Enterprise-grade rackable 2U RISC-V server / datacenter development platform
CPU
32x SiFive P870-D cores
Clock Speed
2 GHz
Memory
256 GB DDR5-5600
Expansion
4 lanes of PCIe (per the published specification summary)
ISA Compliance
Fully RVA23 compliant
Software Porting
Eliminates complex custom porting, enabling out-of-the-box deployment of standard enterprise software environments
Supported Operating Systems
Canonical Ubuntu 26.04 LTS and Red Hat RHEL10
Accelerator Collaboration
SiFive and NVIDIA are working together to port CUDA to SiFive-based RISC-V hardware
Fabric Integration
NVLink Fusion integration planned for future SiFive platforms
Demonstration
Shown at an event coinciding with Hot Chips running server workloads on the P870-D-powered platform
Primary Use
Accelerating RISC-V datacenter software porting, workload optimisation and system validation
Positioning
Stated by SiFive as the world's first enterprise-grade, rackable 2U RISC-V server
Overview
The SiFive BigSky SF-2U870 is a rackable 2U RISC-V server built as a datacenter development platform. SiFive positions it as the world's first enterprise-grade rackable 2U RISC-V server, and demonstrated it running server workloads at an event coinciding with Hot Chips. The configuration pairs 32 SiFive P870-D cores at 2 GHz with 256 GB of DDR5-5600 memory.
The platform's significance is software rather than fLOPS. It is fully RVA23 compliant, which SiFive states removes the need for complex custom porting and allows out-of-the-box deployment of standard enterprise environments — specifically Canonical Ubuntu 26.04 LTS and Red Hat RHEL10. For organisations evaluating RISC-V in the datacenter, that turns the platform into a validation and workload-optimisation vehicle rather than a science project.
The broader ecosystem direction is notable: SiFive and NVIDIA are collaborating to port CUDA to SiFive-based RISC-V hardware and to integrate NVLink Fusion into future SiFive platforms, with CUDA running on the P870-D-powered BigSky platform used for that work. For buyers planning RISC-V datacenter pilots, the SF-2U870 is the reference system on which that software stack is being brought up.
Key Benefits
32 SiFive P870-D cores at 2 GHz with 256 GB DDR5-5600 in a standard 2U rackable form factor. Full RVA23 compliance with Ubuntu 26.04 LTS and RHEL10 support means standard enterprise software runs without custom ports. Purpose-built for datacenter software porting, workload optimisation and system validation rather than as a general-purpose product. CUDA porting and planned NVLink Fusion integration with NVIDIA signals an accelerator path for future RISC-V platforms. First-of-its-kind enterprise RISC-V server platform giving a concrete basis for RISC-V datacenter evaluation.
Applications
RISC-V datacenter software porting and validation, enterprise workload optimisation on open-standard ISA hardware, operating system and hypervisor bring-up, academic and national-lab RISC-V research, and early evaluation of accelerator integration paths including CUDA and NVLink Fusion.
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