Supermicro Expands FullGradient RDHx Product Line for Data Center LiquidCooling Retrofit
On July 15, 2026, Supermicro released ten new-grade RDHx products under its DCBBS modular building-block liquid-cooling portfolio. As a professional rear door heat exchanger manufacturer, Supermicro delivers cost-effective retrofitting solutions for legacy air-cooled computer rooms. The hardware is compatible with NVIDIA MGX, ORv3 and standard EIA compute racks, supporting next-generation high-power AI servers including GB300, Rubin and AMD Helios. It adopts indirect air-to-liquid heat exchange, isolating coolant from server components to eliminate internal leakage risks.
Capable of delivering 10 kW-120 kW cooling capacity per unit and up to 240 kW for dual-door parallel deployment, the high-performance rack rear door heat exchanger covers most AI-inference and small-to-medium training rack workloads. It fits 42U/52U EIA, OCP ORv3 and NVIDIA MGX racks with flexible dimension adaptation. Equipped with N+1 redundant EC fans and dual-AC/DC power supply, it supports hot-swap fan maintenance and works with chilled-water or 45 ℃ warm-water circuits with built-in anti-condensation control.
Two mainstream deployment modes are available for flexible project implementation. The server rear door heat exchanger supports standalone air-assisted cooling for legacy-facility retrofits, requiring no server modification or cold-plate installation and completing single-rack upgrade within one day without equipment de-racking. It can also work together with direct-to-chip cold plates to build hybrid liquid-cooling architectures for higher-density computing requirements.
For system integrators and data-center operators, selecting a reliable rear door liquid heat exchanger supplier directly determines retrofitting cost, construction cycle and long-term operational stability. Global and Chinese vendors have launched complete product portfolios covering ICT original-equipment manufacturers, thermal-control listed enterprises, specialized liquid-cooling enterprises and localized foreign brands. Products vary in cooling range, power supply options and monitoring functions for diversified IDC and HPC scenarios.
With liquid-air indirect heat transfer as its core principle, the liquid cooled rear door heat exchanger replaces the original cabinet rear door. Server hot exhaust passes through the internal water-cooled heat-exchange core and heat is carried away by circulating coolant. Real-time monitoring via Redfish, SNMP and local Web interfaces tracks water temperature, pressure difference, fan speed and condensation alerts for seamless integration with existing data-center management platforms.
Hybrid liquid-cooling deployment combines chip-level heat dissipation with cabinet-level waste-heat removal. The cold plate rear door heat exchanger solution installs micro-channel cold plates on CPUs and GPUs to handle core-chip heat loads, while the rear-door unit dissipates residual heat from memory, hard disks and switches. Total rack cooling capacity reaches 240 kW, well-suited for Rubin-based large-model training clusters and newly-built intelligent-computing facilities, greatly reducing CRAC air-conditioning workloads.
Targeting compute hardware with extreme thermal output, the high density server rear door heat exchanger brings prominent comprehensive advantages. It cuts retrofitting costs by over 40 % and shortens rack commissioning time by 70 % compared with full cold-plate or immersion liquid-cooling schemes. It adapts to both old-generation 2U/4U rack-mount servers and modern bladestyle AI racks, effectively eliminating data-center hot-spot issues and bringing PUE down to 1.15-1.20.
Widely adopted in legacy-facility renovation and new-build intelligent-computing projects, the data center rear door heat exchanger features high safety tolerance and standardized modular delivery. Coolant is confined inside the rear-door assembly completely separated from IT hardware. Multi-layer protections including N+1 fan redundancy, anti-condensation modules and leakage sensors lower operation-and-maintenance barriers. Domestic vendors such as Huawei Digital Energy, Inspur, Envicool, RockCooling and Vertiv provide mature localized products for large-scale domestic AI-compute infrastructure construction.
EXTRCOOL keeps it cool—with a full line of liquid cooling gear: CDUs, cold plates, manifolds, and piping, available out-of-the-box or tailor-made to your specs. Efficient, eco-friendly, and proven at gigawatt scale worldwide. When reliability counts, count on EXTRCOOL.
Full specs & custom builds: https://www.extrcool.com
