AI server power supply heat sinks should be selected around the losses and installation conditions of the power electronics. The server’s computing capacity or rack power rating does not directly state how much heat a particular heat sink must remove.
AI server power supply heat sinks: quick answer
AI server power supply heat sinks must be sized for the losses assigned to the cooler, not the electrical output rating. Electrical isolation, mounting and installed airflow belong in the same review.
For an OEM developing a power supply or conversion module, the useful specification connects component losses, electrical constraints, airflow and the mechanical mounting arrangement. That creates a manufacturable part and a testable acceptance target.
Why power electronics remain a relevant cooling application
NVIDIA’s DGX GB rack hardware guide describes power shelves with air-cooled power supply units. This provides a concrete example of air-cooled power equipment within a rack-scale AI architecture. It does not establish that a particular TDB heat sink is approved for that platform. See NVIDIA — DGX GB rack hardware guide.
The opportunity for a component manufacturer is to meet a specific OEM drawing and qualification program. Buyers should identify the power-conversion stage and cooling boundary instead of asking for a generic “AI heat sink.”
Calculate losses at the intended operating points
Heat dissipation is the relevant input, rather than electrical output power. For an illustrative converter delivering 3,000 W at 96% efficiency, input power is 3,000/0.96 = 3,125 W and total losses are 125 W. This is an arithmetic example, not a product rating or a proposed TDB design.
Those losses are distributed among semiconductors, magnetic components and other elements. Determine which losses pass through the proposed cooler. Include operating points that may produce high local temperatures, rather than assuming rated load is always the only critical condition.
Keep electrical isolation in the design review
A conductive heat sink can interact with the product’s insulation strategy. The electrical design owner should specify clearance, creepage, insulating interfaces and any dielectric test requirements under the applicable product rules. Mechanical changes must preserve those requirements.
Do not assume a decorative or protective coating provides certified electrical insulation. If an insulating pad is used, review its thermal behavior and assembly requirements alongside its electrical function. The supplier should receive the approved specification rather than choose the insulation system independently.
Connect mounting features to the thermal interface
Define the device contact locations, load application points and accessible screw paths. Review whether several components share one base and whether their heights or tolerances create uneven contact. A common cooler can require separate interface provisions for different devices.
Cold forming may be considered for a suitable integral geometry, followed by machining of critical faces and mounting details. The design review should identify the surfaces that need controlled flatness and the regions where as-formed features are acceptable.
Test the installed airflow path
Power supplies often have constrained internal flow paths. Include nearby components, inlet restrictions, cables and the intended fan control condition in the thermal evaluation. Check whether air passes through the fin field or bypasses it, and whether another component preheats the incoming stream.
Record inlet temperature, dissipated heat, flow conditions and component temperatures during testing. Where the product specification includes degraded cooling or abnormal operating conditions, the system design owner should define those cases and their acceptance criteria.
Send a component-level RFQ to TDB
TDB Hanoi has an aluminum cold-forming line. For a proposed power electronics heat sink, review the alloy, formed geometry, CNC milling services, finishing and inspection scope as one manufacturing package. Electrical and thermal system approval must remain explicit customer or agreed specialist responsibilities.
To request a review, send TDB Hanoi your drawing and project requirements. Include the heat loss map and electrical keep-outs as well as the CAD model and expected volume.
TDB Hanoi impact extrusion project capability
TDB Hanoi has an aluminum cold-forming production line with press capacity up to 500 tons and can form products weighing up to 1 kg. These are equipment and part-mass capability limits; feasibility depends on the alloy, geometry, tooling and required final condition. They do not imply that every 1 kg design can be formed or that a thermal rating is guaranteed.
| Capability item | Project review basis |
|---|---|
| Maximum stated press capacity | 500 tons |
| Maximum stated product mass | 1 kg |
| Dimensions, pin geometry and tolerances | Confirmed after drawing, material and tooling review |
| Thermal acceptance | Agreed test conditions and responsible party |
For AI server power supply heat sinks, include the component drawing and its functional requirements so TDB can review the suitable manufacturing scope.
Frequently asked questions
Does a 3 kW power supply need to dissipate 3 kW through its heat sink?
No. Use the actual losses assigned to that heat sink. Output power and dissipated heat are different quantities.
Can cold forging prove the part is electrically safe?
No. Electrical safety depends on the complete design and required testing.
Can one heat sink support several power devices?
Possibly. Evaluate shared heat spreading, contact heights, isolation and mounting loads for the actual assembly.
Related impact extrusion guides
- Cold Forged Aluminum Heat Sinks for AI Hardware: An OEM Guide
- Pin Fin Heat Sink Design for AI Electronics: Airflow and Forming DFM
- Cold Forged Heat Sinks vs Liquid Cold Plates for AI: Where Aluminum Fits
- Custom Cold Forged Heat Sinks in Vietnam: RFQ, Tooling and Production Planning
Browse the Impact Extrusion knowledge center or request a part-specific manufacturing review.