SiFive says it has raised an oversubscribed $400 million Series G that values the RISC-V chip IP company at $3.65 billion, marking one of the bigger AI infrastructure financings of the year. The company said the round was led by Atreides Management and included NVIDIA, Apollo Global Management, Point72 Turion, T. Rowe Price, Prosperity7 Ventures, and Sutter Hill Ventures.

What the money is for

According to SiFive's announcement, the funding will accelerate its high-performance RISC-V CPU and AI IP roadmap for data centers, expand engineering teams, and grow the software stack around its platform. The company said current priorities include scalar, vector, and matrix IP, plus more work on software support for CUDA, Red Hat, and Ubuntu.

SiFive has been pitching its architecture as an open alternative to legacy CPU designs at a time when agent-style AI systems are putting more pressure on orchestration, memory movement, and power efficiency inside modern data centers.

Why it matters

The conservative takeaway is not that SiFive has displaced x86 or Arm, but that investors are willing to fund another serious CPU architecture bet for AI infrastructure. That matters more because SiFive already announced support for NVIDIA NVLink Fusion earlier this year, positioning its RISC-V designs to connect more tightly with NVIDIA accelerators in future AI systems.

If SiFive can turn that financing into real hyperscaler deployments, RISC-V could move further from embedded systems into mainstream AI data center design.