Manufacturer s Liquid-Cooled Switch QSFP-DD

Liquid-cooled QSFP-DD switches leverage high-density 8-lane QSFP-DD modules to deliver up to 800 Gbps per port while efficiently managing heat in high-performance data center environments.

Overview of QSFP-DD Technology

QSFP-DD (Quad Small Form-Factor Pluggable Double Density) modules double the lane capacity of standard QSFP interconnects, providing eight-lane electrical interfaces capable of 28 Gbps NRZ, 56 Gbps PAM4, and 112 Gbps PAM4, supporting aggregate bandwidths up to 800 Gbps per port . These modules are backwards compatible with legacy QSFP ports, allowing seamless upgrades without replacing existing infrastructure . QSFP-DD supports high-density deployments, enabling switches to maintain maximum port density while meeting the bandwidth demands of AI/ML, HPC, and cloud computing workloads .

Thermal Management and Liquid Cooling

High-performance QSFP-DD switches can operate at 15–18W per module, generating significant heat that must be managed to maintain signal integrity and reliability . While traditional air-cooled cages use heat sinks and airflow, liquid-cooled switches integrate liquid heat exchangers or cold plates to remove heat more efficiently, allowing higher power dissipation per port and denser switch designs. This approach is particularly beneficial in 1U or 2U high-density switches, where airflow is limited and thermal constraints are critical .

Performance and Applications

Liquid-cooled QSFP-DD switches are designed for ultra-low latency, high-bandwidth environments, including:

• High-Performance Computing (HPC) clusters and supercomputers, such as HPE Slingshot-enabled systems .
• AI/ML workloads requiring consistent throughput and minimal congestion.
• Cloud data centers with high-density 400G or 800G interconnects. These switches often feature adaptive congestion management, fine-grained routing, and real-time thermal monitoring, ensuring stable operation under maximum load . With liquid cooling, switches can sustain continuous high-power operation without throttling, supporting multi-terabit per second switch fabrics.

Compatibility and Upgrade Path

QSFP-DD switches maintain backward compatibility with QSFP, QSFP28, and QSFP56 modules, allowing gradual infrastructure upgrades . This ensures that data centers can adopt liquid-cooled high-speed switches without replacing all existing cabling or transceivers, providing a cost-effective path to 800G and beyond.

Key Takeaways

• QSFP-DD modules provide 8-lane, high-speed connectivity up to 800 Gbps per port.
• Liquid cooling enables higher power dissipation, denser switch designs, and improved thermal reliability.
• Ideal for HPC, AI/ML, and cloud data centers requiring high bandwidth and low latency.
• Backward compatibility ensures smooth upgrades from existing QSFP infrastructure. Liquid-cooled QSFP-DD switches represent a next-generation solution for high-density, high-performance networking, combining maximum bandwidth, thermal efficiency, and scalability for modern data center and HPC environments .