SiFive Raises $400M at $3.65B Valuation as the RISC-V AI Data Center Race Heats Up The AI infrastructure market just got a clear signal: the CPU layer is back in play. SiFive announced a $400 million oversubscribed Series G round at a $3.65 billion valuation, with participation from... AI chips Nvidia RISC-V data center semiconductors Apr 11, 2026