SiPearl's Rhea1 CPU Ships to JUPITER Supercomputer

French chip designer SiPearl began delivering its long-awaited Rhea1 CPUs to system builder Bull for integration into Europe's JUPITER exascale supercomputer, giving the EU's flagship HPC system its first domestic silicon partition. The 80-core, Arm-based chip will power a 1,300-node, 5-petaFLOP CPU section alongside JUPITER's Nvidia GH200-powered GPU booster.

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SiPearl's Rhea1 delivery marks the EU's first tangible step toward reducing dependence on US silicon in critical scientific and sovereign-compute infrastructure, a milestone EuroHPC JU and European policymakers have long sought. While the CPU partition is dwarfed by JUPITER's Nvidia-powered booster in raw performance, the symbolic and strategic value for European chip sovereignty is significant, potentially unlocking further public funding and procurement for SiPearl and its successor Rhea2. The win also validates AMD's position in Europe via the upcoming Alice Recoque system, which will pair Rhea2 CPUs with AMD MI430X GPUs, diversifying the EU's accelerator base away from Nvidia. Near-term revenue impact is limited given the small scale of the CPU partition relative to global HPC/AI silicon spending, but it strengthens the long-term case for EU-funded domestic chip design programs. Investors should watch for follow-on EuroHPC contracts and whether SiPearl can scale Rhea2 competitively against Arm-based rivals like Fujitsu's Monaka and Nvidia's Grace line.