To select a dual-CPU liquid cooling module, start with the processors’ maximum thermal design requirements, then verify that the module fits the server’s socket layout, coolant loop, and service constraints. A suitable design must cool both CPUs within their permitted operating temperatures while meeting the system’s flow, pressure-drop, material, and leak-management requirements. Do not assume that a module designed for one dual-socket server will fit another: socket spacing, keep-out zones, mounting hardware, and tubing routes can differ. This guide explains how to assess those factors and prepare a useful supplier request.
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This guide is for server and HPC system designers, thermal engineers, procurement teams, and OEMs evaluating liquid cooling for two-processor platforms. It is relevant when you are developing a new chassis, replacing an existing cooling assembly, or comparing custom and standard module options. The recommendations focus on selection and integration rather than prescribing a single configuration. Final suitability should be confirmed against your processor documentation and system-level thermal requirements.
A dual-CPU module transfers heat from two processors to a circulating coolant. Depending on the design, it may use two cold plates connected as one assembly, or a shared structure with separate contact areas and flow paths. The module typically interfaces with a facility or rack-level coolant loop through hoses or manifolds, but the exact arrangement depends on the server architecture.
Heat moves from each processor’s package through the thermal interface material and cold-plate base into the coolant. The warmed fluid then carries that energy away from the processors. A module’s performance therefore depends not only on its cold plates, but also on contact pressure, coolant flow, inlet temperature, channel geometry, and the rest of the cooling loop.
Common design choices include separate cold plates joined by tubing, a dual-plate assembly with a shared manifold, and configurations tailored to a particular board or chassis. Copper is frequently considered for cold-plate heat transfer, while other metals or combinations may be selected to address weight, cost, corrosion, or manufacturing requirements. Material selection must account for the other wetted components in the loop, since dissimilar metals and coolant chemistry can affect corrosion risk.
Connection style, seal design, tubing material, and manifold arrangement are also important. These choices influence routing, installation, maintenance, and compatibility with the wider system. Ask the supplier to identify wetted materials and sealing components, rather than evaluating the cold-plate material alone.
Begin with the expected workload and processor configuration. A server running sustained compute workloads may present a different heat profile from one with intermittent peaks, even when processor model numbers appear similar. Use the processor and platform documentation to identify applicable thermal limits, power assumptions, and mounting requirements, then establish whether the cooling target is steady-state, transient, or both.
HPC systems may place additional emphasis on sustained operation, node density, and consistent cooling across multiple servers. In a compact chassis, tube bends, connector access, and service clearance can be just as important as cold-plate capacity. For a retrofit, confirm that the module works with the existing board, retention hardware, rack plumbing, and coolant specification before comparing price.
Record the heat load for each processor and the combined design load, including any margin required by your engineering policy. A first-pass coolant heat calculation can help check whether a proposed flow rate is plausible: heat transfer is approximately mass flow multiplied by coolant heat capacity and temperature rise. For water, using an approximate specific heat of 4.18 kJ/kg·K, a flow of 1 L/min and a 5 K temperature rise corresponds to roughly 348 W of heat transport, assuming water density near 1 kg/L.
This is an illustrative energy-balance estimate, not a performance rating for any particular module. It does not account for cold-plate thermal resistance, local hot spots, flow distribution between CPUs, or the limits of the pump and loop. Request pressure-drop and thermal data at the operating conditions relevant to your design, and confirm that the supplier’s test conditions match your intended coolant and flow range.
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Provide the board or cold-plate interface drawing, processor socket locations, mounting details, and available height and width. Identify nearby components that may obstruct the module or its tubing, and specify access needed for assembly and maintenance. Also state the expected orientation, vibration environment, and any restrictions on added mass or tube routing.
Check that the module does not interfere with memory, power components, neighboring boards, or the chassis cover. Confirm the mounting load and contact arrangement with the platform team, because uneven pressure can undermine thermal contact or risk damage. If the assembly is intended for field replacement, include connector accessibility and handling procedures in the design review.
Specify the coolant type, inlet-temperature range, operating pressure, and any water-quality or inhibitor requirements established for the system. Ask for the module’s pressure-drop curve or values at stated flow rates, and clarify whether those figures include the manifold and connection fittings. Confirm that seals, tubing, plates, and fittings are compatible with the selected fluid and with one another.
Define how the system will detect and manage leakage, and determine whether quick disconnects, dripless connections, or other service features are required. These are system-design decisions rather than universal module features. A supplier can evaluate the requested interfaces, but the final loop design should be reviewed as a complete assembly.
Use a common specification sheet when comparing options so that quotations refer to the same operating conditions. At minimum, request the information below and note any items that remain unconfirmed. A blank or “to be determined” value is preferable to treating an unverified assumption as a specification.
| Selection area | Information to request | Why it matters |
|---|---|---|
| Thermal | Heat-load basis, inlet temperature, flow rate, test conditions, and thermal resistance or temperature-rise data | Allows comparison under relevant operating conditions |
| Hydraulic | Pressure drop, flow distribution, connection size, and operating pressure | Helps determine compatibility with the pump and loop |
| Mechanical | Dimensions, mass, mounting interface, tube routing, and service clearance | Reduces fit and maintenance risks |
| Materials | Wetted metals, tubing, seals, and coolant compatibility | Supports corrosion and reliability review |
| Quality and supply | Inspection scope, traceability options, packaging, MOQ, and lead-time assumptions | Clarifies qualification and purchasing expectations |
Pricing depends on the module’s materials, geometry, connection hardware, manufacturing route, inspection needs, and order quantity. A standard configuration may have a different cost and schedule from a design requiring new tooling, custom routing, or qualification samples. Request a quotation that separates one-time engineering or tooling charges from recurring unit pricing where applicable.
Ask suppliers to state MOQ, sample availability, production lead time, and the assumptions behind each figure. Lead time can change if drawings, materials, or interface details are not finalized, so include approval milestones in your sourcing plan. For a fair comparison, give each supplier the same drawings, coolant conditions, forecast quantities, and quality requirements.
Look for responses that distinguish confirmed specifications from estimates and design proposals. Ask how revisions are controlled after drawing approval and what inspection records can be supplied for your order. These discussions help your engineering and procurement teams identify integration risks before committing to production quantities.
The right dual-CPU liquid cooling module is the one that meets both processors’ thermal needs and fits the complete server cooling loop, not simply the one with the lowest quoted price or the most compact appearance. Establish heat loads, coolant conditions, mechanical interfaces, and service requirements before comparing designs. Treat basic flow calculations as screening tools, then verify actual thermal and hydraulic performance using supplier data relevant to your operating conditions.
To move forward, prepare your processor and board details, target operating conditions, coolant specification, expected quantity, and preferred connection arrangement. Jadecooling Tech can review these inputs with your team and discuss a suitable module configuration, documentation, and quotation scope. Contact us with your requirements to begin a technical and sourcing review.
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