English
Supermicro enriched its Data Center Building Block Solutions liquid cooling range with a 10-model Rear Door Heat Exchanger (RDHx) series, delivering 10kW–120kW door cooling capacity and a maximum 240kW per rack. The updated lineup targets data center operators seeking quick, minimally disruptive liquid cooling upgrades, for both new AI infrastructure construction and fitting high-density racks into legacy facilities not engineered for heavy thermal loads.
Supermicro Rear Door Heat Exchanger Series
These heat exchanger doors fit standard EIA, ORv3 and MGX racks, functioning either as standalone liquid cooling hardware or paired with Supermicro direct-to-chip (D2C) cold plates for full DCBBS deployments. By dissipating exhaust heat at rack level, they remove the demand for hot/cold aisle containment, cutting major retrofitting expenditures.
Supermicro states the lineup supports hardware from NVIDIA GB300, B300, Vera Rubin to AMD’s upcoming Helios platforms, accounting for the 240kW rack power ceiling. Both DC variants connecting to rack busbars and AC models for wide infrastructure compatibility are provided, featuring smart fan regulation, N+1 fan redundancy and anti-condensation safeguards across all units. Monitoring access covers Redfish, SNMP, web portal and Supermicro SuperCloud Composer. Notably, deployment does not rely on dedicated facility chilled water, eliminating a key barrier to retrofits.
Consistent with other DCBBS products, the heat doors can be supplied as validated rack-scale bundles including accelerated servers, rack integration, facility power & cooling systems, management software and on-site deployment services, streamlining procurement and cutting deployment lead times.
The Resurgence of Rear Door Heat Exchangers
RDHx is a mature data center cooling solution revitalized by booming AI infrastructure expansion. IBM launched the first commercial model, Cool Blue RDHx, in 2005: a passive water-cooled coil replacing rack rear doors with 15kW cooling capacity, offsetting over half the heat output of high-density racks back then. Its core value remains unchanged today: once rack power exceeds air cooling limits of hot/cold aisle layouts, operators must either extract heat at the rack or waste massive energy on room-wide air conditioning.
The working principle is straightforward: server exhaust air flows through liquid-filled coils before exiting the rack, transferring heat to facility water circuits without warming the data center space. Passive models depend on built-in server fans for airflow, while Supermicro’s active versions add extra fan banks to accommodate thicker coils and higher cooling loads. With heat confined within rack enclosures, the main room maintains stable temperature, eliminating complex aisle containment and reducing air conditioner workload. Crucially, retrofits require no hardware modifications to servers, making RDHx the mainstream entry point for liquid cooling upgrades in existing sites.
2026 Supermicro RDHx for AI Workloads
For AI deployments, rear door coolers serve as complementary hardware to D2C liquid cooling. Cold plates fitted on CPUs and GPUs capture 70–80% of server heat, yet residual heat from memory, network adapters, storage drives and power supplies still vents as hot air. Matching D2C with RDHx recovers this leftover thermal load, channeling nearly all rack heat into facility water loops for efficient dissipation or waste heat reuse.
This design aligns with Dell’s strategy showcased at last year’s Dell Technologies World via its sealed-airflow PowerCool Enclosed RDHx, which Dell claims captures 100% IT heat and slashes cooling power costs by up to 60%. While Supermicro’s solution adopts a more modular structure versus Dell’s fully enclosed design, both vendors pursue the same goal: transferring all rack heat into water for simpler, recyclable thermal management.
Product Availability
The expanded RDHx lineup is now purchasable under Supermicro DCBBS, scalable from single racks to complete data center builds.
Beijing Qianxing Jietong Technology Co., Ltd.
Sandy Yang/Global Strategy Director
WhatsApp / WeChat: +86 13426366826
Email: yangyd@qianxingdata.com
Website: www.qianxingdata.com/www.storagesserver.com
Business Focus:
ICT Product Distribution/System Integration & Services/Infrastructure Solutions
With 20+ years of IT distribution experience, we partner with leading global brands to deliver reliable products and professional services.
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Sandy Yang/Global Strategy Director
WhatsApp / WeChat: +86 13426366826
Email: yangyd@qianxingdata.com
Website: www.qianxingdata.com/www.storagesserver.com
Business Focus:
ICT Product Distribution/System Integration & Services/Infrastructure Solutions
With 20+ years of IT distribution experience, we partner with leading global brands to deliver reliable products and professional services.
“Using Technology to Build an Intelligent World”Your Trusted ICT Product Service Provider!