Leo CXL® Smart Memory Controllers

Purpose-built memory expansion, sharing, and pooling for AI and cloud platforms

Download Portfolio Brief

Memory Solutions for the AI Era

  • Accelerates AI and cloud infrastructure with memory expansion, sharing, and pooling for enhanced performance
  • Eliminates bandwidth/capacity bottlenecks, reduces total cost of ownership, and optimizes memory utilization
  • Ensures end-to-end data integrity and protection with best-in-class industry standard security features
  • Delivers server-grade customizable RAS, advanced diagnostics, and fleet management via COSMOS suite

Leo Highlights

Accelerating AI with CXL Memory

Increase Memory
Capacity

With multiple DDR5 channels,
up to 5600 MT/s

Seamless
Interoperability Across

Stress tested with all major xPUs and Memory vendors

Enhanced Diagnostics
& Telemetry

Advanced capabilities through in-band and out-of-band management

Leo Delivers Proven Application Value with CXL

Astera Labs’ Leo CXL Smart Memory Controller is the industry’s first purpose-built solution that supports both memory expansion and memory pooling to solve performance bottlenecks and capacity constraints in cloud servers.

AI Inferencing: Recommendation System

73% more recommendations per second

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AI Inferencing: Chatbot Services

40% faster time to insights with LLM

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HPC: Computer Aided Engineering

50% more iterations per second

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In-Memory Databases: Transaction Processing

150% more transactions per second

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E-Series

  • Memory Expansion

P-Series

  • Memory Expansion
  • Memory Pooling
  • Memory Sharing

Leo A-Series Hardware Solutions

Leo A-Series CXL Smart Memory Hardware solutions offer all the benefits of Leo Controllers and enable quick plug-and-play deployment with faster time-to-market for system OEMs and data centers.

  • PCIe x16 CEM add-in card form factor
  • Up to 4x DDR5 RDIMMs supporting up to 2TB
  • On-board debug connectors for fleet management on Cloud Servers
  • Temperature and health monitoring of Leo controller and memory
  • RDIMM fault isolation and error correction
  • High volume production-qualified solutions with robust supply chain

Use Cases

Memory Disaggregation

Expand, pool and share memory between multiple servers to increase memory bandwidth and capacity while providing the option to reclaim stranded or under-utilized…

Resources

Ordering Information

Orderable Part NumberImageDocumentsDescriptionCXL SpecCXL LinkMemoryCapacityExpansionPooling / SharingOrdering
A1000-1254ABA1000-1254ABhttps://www.asteralabs.com/wp-content/uploads/2025/05/Leo_CXL_Smart_Memory_Controllers_Portfolio_Brief.pdfLeo A1000 CXL™ Smart Memory Add-in Card CXL 1.1/2.016x32G4x DDR5-5600 RDIMM slots, 2TB2TBYesYeshttps://www.asteralabs.com/product-details/a1000-1254ab/
CM5082E-*CM5082E-*https://www.asteralabs.com/wp-content/uploads/2025/05/Leo_CXL_Smart_Memory_Controllers_Portfolio_Brief.pdfLeo E-Series CXL 2.0 x8 Smart Memory ControllerCXL 1.1/2.08x32G2ch DDR5 Up To 5600MT/s2TBYesNohttps://www.asteralabs.com/product-details/cm5082e/
CM5162E-*CM5162E-*https://www.asteralabs.com/wp-content/uploads/2025/05/Leo_CXL_Smart_Memory_Controllers_Portfolio_Brief.pdfLeo E-Series CXL 2.0 x16 Smart Memory Controller CXL 1.1/2.016x32G2ch DDR5 Up To 5600MT/s2TBYesNohttps://www.asteralabs.com/product-details/cm5162e/
CM5162P-*CM5162P-*https://www.asteralabs.com/wp-content/uploads/2025/05/Leo_CXL_Smart_Memory_Controllers_Portfolio_Brief.pdfLeo P-Series CXL 2.0 x16 Smart Memory Controller CXL 1.1/2.016x32G2ch DDR5 Up To 5600MT/s2TBYesYeshttps://www.asteralabs.com/product-details/cm5162p/

Breaking Through the Memory Wall: How CXL Transforms RAG and KV Cache Performance

This week at Supercomputing 2025, the AI infrastructure community is converging to explore the next generation of technologies enabling breakthrough performance at scale. Among the most critical challenges being addressed is the memory bottleneck that increasingly constrains AI deployments.AI workloads, particularly Large Language Model (LLM) applications, are fundamentally memory-bound…. Read more

Astera Labs at Supercomputing 2025: Advancing Rack-Scale AI Connectivity with Open Ecosystems

As AI models surge in complexity and require unprecedented reasoning performance, the industry is undergoing a transformative shift toward what we call “AI Infrastructure 2.0”—where the rack, not the server, becomes the new unit of compute. The scale and tight coupling required by today’s GPU-dense workloads demand ultra-low-latency, high-bandwidth communication across hundreds of… Read more

Astera Labs Completes Acquisition of aiXscale Photonics

Today, Astera Labs completed its acquisition of aiXscale Photonics GmbH, following the definitive agreement announced in October 2025. This marks an important step in our journey to deliver comprehensive connectivity solutions for AI Infrastructure 2.0.Why Photonics Matter for Scale-Up AIAs AI systems scale to hundreds of tightly integrated accelerators per rack, optical connectivity… Read more

Astera Labs’ Leo CXL Smart Memory Controllers on Microsoft Azure M-series Virtual Machines Overcome the Memory Wall

SAN JOSE, Calif.—Nov. 18, 2025—Astera Labs, Inc. (Nasdaq: ALAB), a leader in semiconductor-based connectivity solutions for rack-scale AI infrastructure, today announced its Leo CXL Smart Memory Controllers enable customers to evaluate Compute Express Link® (CXL®) memory expansion capabilities for their specific workloads in the Azure M-series virtual machines (VMs) preview.Microsoft’s… Read more

Astera Labs Announces Fourth Quarter 2025 Financial Conference Participation

SAN JOSE, CA, U.S. – Nov. 13, 2025 – Astera Labs (Nasdaq: ALAB), a leader in semiconductor-based connectivity solutions for rack-scale AI infrastructure, today announced that it will participate in the following upcoming financial conferences during the fourth quarter 2025:2025 RBC Capital Markets Global Technology, Internet, Media & Telecommunications Conference on Nov. 19th… Read more

Astera Labs Announces Financial Results for the Third Quarter of Fiscal Year 2025

Record quarterly revenue of $230.6 million, up 20% QoQ and 104% YoYStrong Q3 revenue growth driven by new AI platform ramps featuring multiple product familiesScorpio fabric switch design wins expand to several platforms at multiple hyperscaler customersSAN JOSE, CA, U.S. – November 4, 2025 – Astera Labs, Inc. (Nasdaq: ALAB), a leader in semiconductor-based connectivity solutions… Read more

Astera Labs to Acquire aiXscale Photonics

Deal is expected to help enable scale-up photonic chiplets in AI Infrastructure 2.0 and accelerate Astera Labs’ deployment of rack-scale solutionsSAN JOSE, Calif.—October 22, 2025—Astera Labs, Inc. (Nasdaq: ALAB), a leader in semiconductor-based connectivity solutions for rack-scale AI infrastructure, today announced that it has entered into a definitive agreement to acquire aiXscale… Read more

COSMOS Explorer: Link Management Tools Demo

Astera Labs’ COSMOS Explorer is a powerful tool for link monitoring, management, and diagnostics. It offers a rich set of system configuration options for you to optimize performance with critical signal quality telemetry such as bit error rate, eye metrics, and link event logs. COSMOS Explorer allows you to modify link settings and get customized diagnostics in one GUI for all of our products.In… Read more

COSMOS and OpenBMC Demo at OCP 2025

Through collaboration with ASPEED Technology and Insyde Software, Astera Labs has extended COSMOS features into production AI systems to standardize management, monitoring and diagnostics of retimers and scale-up switches with OpenBMC and DMTF Redfish APIs. COSMOS now offers:Standard APIs for configuration, monitoring and lifecycle controlActionable insights with granular visibility into… Read more

CXL Memory Innovation at OCP 2025

Rack-scale memory innovation is unlocked with CXL. At OCP Global Summit 2025, Astera Labs demonstrated how Leo CXL Smart Memory Controllers can eliminate AI infrastructure bottlenecks with regards to memory capacity and bandwidth.3x concurrent LLM instances at higher AI throughput3x increased throughput w/ CXL at higher user count3x lower latency with CXLHigher GPU utilization on average with… Read more