Which PowerEdge server supports direct liquid cooling?

Many IT managers face the same problem: modern AI servers generate so much heat that air cooling can’t keep up.

Dell PowerEdge XE9640 and XE9680L servers support direct liquid cooling (DLC) for CPUs and GPUs, offering powerful, dense, and efficient thermal control.

This technology is now reshaping how enterprise data centers manage performance and energy efficiency.

What is direct liquid cooling in servers?

When servers become more powerful, the heat they produce exceeds the limits of traditional air cooling.

Direct liquid cooling (DLC) transfers heat from processors to a liquid coolant through cold plates, removing thermal energy more efficiently than air.

How direct liquid cooling works

Inside a direct liquid-cooled server, the coolant flows through cold plates attached to CPUs or GPUs. These plates are engineered with microchannels to maximize contact area. As the coolant absorbs heat, it flows through hoses into a rack-level manifold and then into the CDU. The CDU transfers that heat to the facility water loop, maintaining a closed and safe circulation system.

Unlike air cooling, DLC doesn’t rely on large fans or ducts. It directly targets heat sources, reducing overall thermal resistance and enabling higher performance per rack. In Dell’s design, the system uses leak-detection sensors and quick-disconnect couplings to simplify maintenance and protect the hardware.

What are its advantages?

Every watt of power used in a data center creates heat that must be removed efficiently.

The advantages of direct liquid cooling include higher cooling capacity, lower power consumption, greater server density, and improved system reliability.

Key performance benefits

Why it matters

In enterprise AI and HPC environments, processors can reach power levels above 700W each. Air cooling can no longer maintain safe operating temperatures at that density. Direct liquid cooling handles that easily because water-based fluids conduct heat far more efficiently.

Dell reports that systems like the PowerEdge XE9680L achieve up to 50% energy savings compared to air-cooled systems, while supporting higher GPU power limits. This allows data centers to run high-density workloads without expanding floor space or cooling infrastructure.

Another important advantage is sustainability. DLC allows the use of warmer water for cooling, which means less energy is needed for chillers, leading to lower carbon emissions.

How to deploy it in enterprise environments?

Deploying direct liquid cooling requires proper planning and infrastructure to ensure safe, efficient operation.

To deploy DLC, use servers designed for liquid cooling, install rack manifolds, connect them to a coolant distribution unit, and integrate leak detection and monitoring.

Enterprise deployment steps

Practical insights

When I first participated in a DLC deployment, the main challenge was coordinating between IT and facility teams. The coolant loops had to be installed with precision, and the temperature of the facility water was raised to 32°C to maximize energy efficiency. After installation, the rack maintained GPU temperatures below 50°C under full load—something impossible with air cooling.

The key to success is integration. Dell’s system uses quick-release couplings for each node, allowing technicians to remove or replace servers without draining the entire system. This modular design makes maintenance safer and faster.

Monitoring is equally important. Modern PowerEdge servers use intelligent management tools to track coolant flow and temperature in real time, preventing failures and optimizing energy use automatically.

What are Dell’s innovations in server cooling?

Dell has been leading the shift toward liquid cooling by introducing both hardware and infrastructure-level innovations.

Dell’s innovations include hybrid cooling systems, leak detection technology, smart coolant monitoring, and integrated rack manifolds for large-scale deployments.

Dell’s key developments

Deep dive into Dell’s technology

Dell’s PowerEdge XE9640 is designed with full DLC integration, where processors and accelerators are cooled directly by liquid, while memory and storage remain air-cooled. This hybrid design balances performance with practicality, reducing the need for external chillers.

The PowerEdge XE9680L takes this further by fully integrating CPU and GPU liquid loops with advanced leak detection. The system can handle extreme workloads, such as training large AI models, while reducing cooling power by up to half.

Dell also developed rack-door heat exchangers that capture nearly 100% of rack heat and recycle it into building heating systems. This approach transforms waste heat into usable energy, improving sustainability and lowering total operating costs.

Another breakthrough is smart liquid flow control. Using iDRAC and telemetry sensors, Dell servers can adjust coolant flow dynamically based on load and temperature, maintaining optimal performance without human intervention.

Conclusion

Dell PowerEdge XE9640 and XE9680L servers lead the way in direct liquid cooling technology. By circulating coolant directly through processors, they achieve unmatched efficiency, reliability, and performance density. With Dell’s innovations in hybrid cooling, leak protection, and smart monitoring, enterprises can now deploy high-power AI and HPC workloads with confidence and sustainability.

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