SiFive's BigSky SF-2U870 puts 32 P870-D cores and RVA23 support in a 2U server that runs Ubuntu 26.04 out of the box

Sources: primary, discussion
Summary: Chips and Cheese reports the configuration as 32 P870-D cores at 2.2 GHz, 256 GB of DDR5-5600, and 64 lanes of PCIe 5.0 plus 4 of PCIe Gen 3.0, running a stock Ubuntu 26.04 install. The author frames BigSky as an RVA23 development platform rather than a competitor to x86 or Arm. The write-up records that SiFive's own product page is internally inconsistent on both clock speed and storage capacity, so those two figures rest on the author's stated assumption rather than on a consistent vendor page.
Why it matters: NVIDIA named the RVA23 profile as a requirement for CUDA on a RISC-V host at Hot Chips 2026, covered in this section today, and BigSky is an RVA23 machine that boots a stock distribution.