AI Server Head Node

Deliver high-performance, robust PCIe link connectivity with optimized thermal efficiency for CPU root complex server boards that connect to GPU baseboards in AI servers

Requirements and Challenges​

  • AI servers with multiple connectors between the AI head node to the GPU baseboard presents significant PCIe signal integrity and link stability challenges that must be addressed for maximum system uptime
  • Developing dense AI servers with high performance PCIe connectivity introduces routing, power delivery and thermal design constraints
  • Head nodes managing the activities of the other servers in the cluster require devices with flexible software for diagnostics, customization, and Link, Fleet and RAS management
  • Dense PCIe links between multiple GPUs, CPU root complexes, PCIe switches, and other endpoints present risks in system design and data center deployment without rigorous interoperability testing 

Aries Smart DSP Retimer Benefits​

  • Purpose-built for demanding AI server channels and delivers robust signal integrity and link stability over long distances for dense AI server head node boards with multiple high-speed connectors
  • Low latency with a compact footprint for optimized performance, power consumption and thermal efficiency provides system designers flexibility to create PCB layouts that adhere to stringent requirements
  • Real-time lane, link and device health monitoring and management features with Astera Labs’ COSMOS suite that provides comprehensive diagnostics and advanced Link, Fleet and RAS management for cloud-scale deployments 
  • Rigorously tested for interoperability in our Cloud-Scale Interop Lab with leading GPU, CPU, PCIe switch, network, and storage endpoints to minimize deployment risk and accelerate time-to-market


Orderable Part NumberDocumentsRetimer GenerationMax PCIe GenPCIe LanesOrderingStatus
PT6082LR 6.xx 8Contact Us,
PT6082LX 6.x / CXL 3.xx 8Contact Us,
PT6162LR 6.xx 16Contact Us,
PT6162LX 6.x / CXL 3.xx 16Contact Us,
PT5082LR 5.0x 8Contact Us,
PT5082LX 5.0 / CXL 2.0x 8Contact Us,
PT5162LR 5.0x 16Contact Us,
PT5162LX 5.0 / CXL 2.0x 16Contact Us,
PT5081LR 5.0x 8Contact Us,
PT5081LX 5.0 / CXL 2.0x 8Contact Us,
PT5161LR 5.0x 16Contact Us,
PT5161LX 5.0 / CXL 2.0x 16Contact Us,
PT4080LR 4.0x 8Contact Us,
PT4161LR 4.0x 16Contact Us,