•320-lane PCIe 6.0 chip supports 5.12 TB/s bandwidth for rack-scale AI
•Open PCIe standard challenges Nvidia's proprietary NVSwitch scale-up fabric
The fact
Astera Labs has introduced Scorpio X, a PCIe 6.0-based AI fabric switch ASIC for rack-scale GPU interconnects. The chip integrates 320 lanes of PCIe connectivity offering 5.12 TB/s of bidirectional bandwidth. It incorporates in-network compute and Hypercast multicast optimisation for mixture-of-experts inference workloads. Astera is also extending its Scorpio P-series alongside the COSMOS management suite. Sampling is underway, with production expected in the second half of 2026.
The Assessment
Scorpio X positions PCIe 6.0 as a vendor-agnostic alternative to Nvidia's proprietary NVSwitch for rack-scale GPU interconnects — not a direct performance challenger, but a path to multi-vendor, disaggregated AI architectures. Astera's strategy leverages PCIe's existing ubiquity across GPUs, NICs and storage controllers to reduce lock-in risk. For AI data centre operators, the trade-off is clear: NVSwitch offers raw scale-up bandwidth, while PCIe 6.0 promises interoperability across Nvidia, AMD and custom silicon. The product also strengthens Astera's move from component-level retimers into system-level switch ASICs.
What to Watch
Whether cloud operators adopt Scorpio X to reduce NVSwitch dependency, and if Broadcom or Marvell announce competing PCIe 6.0 switch products — testing whether PCIe-based AI fabrics become an industry standard or remain a niche alternative.
Also read: LG and Nvidia explore robotics and AI infrastructure partnership
