Quick answer: turn an AI server cold plate requirement into a manufacturing solution
BAOSONG provides custom AI server cold plate solutions, connecting aluminum component manufacturing with your thermal, mounting and production requirements. For a new design suited to an aluminum fluid path, our starting recommendation is an aluminum body that combines the required cooling geometry with practical mounting and connection features. Direct-to-chip cold plates move heat from the processor’s specified contact interface into circulating coolant.
Use aluminum where its low mass, adaptable geometry and manufacturing options improve the finished assembly. We recommend the body, cover and closure together. Where an approved copper core or fixed wetted-material requirement governs the design, we retain that thermal path and develop the aluminum carrier or mounting structure around it. An approved drawing goes into manufacturing review and quotation without an unnecessary redesign.
Bring us the project as it stands. Send a drawing, sample photo or a short description of your cooling challenge. We identify the component scope, recommend a construction and manufacturing route, and establish the quotation and acceptance basis with your team.
At a glance: the solution we recommend for each starting point
| Your requirement | Our recommended direction | Why it is useful |
|---|---|---|
| New component; aluminum-compatible loop | Develop an aluminum body with the channel, mounting, port and cover requirements considered together. | Uses low mass and geometry integration while keeping manufacturing practical. |
| Existing qualified thermal core; new mechanical interface | Retain the core and adapt a separate aluminum frame, carrier or mounting component. | Concentrates the change on the interface that actually needs it. |
| Released drawing ready for supply | Review and quote the approved specification; submit any improvement as an explicit change proposal. | Moves directly toward sourcing and first-article acceptance. |
| Repeated geometry and growing order quantities | Compare machining, stock form, joining, fixtures and inspection at the required batch sizes. | Makes tooling and recurring cost visible before committing the order. |
| Thermal target exceeds the proposed aluminum design | Identify the limiting resistance and recommend a revised contact/channel design or a copper-based thermal core. | Solves the constraint while retaining aluminum in suitable structural features. |
Define the cold plate component and its connection to the server
A data center cold plate is purchased against a component or assembly boundary. The quotation should state whether it covers a machined base and cover, a sealed cold plate, or a plate with specified fittings and mounting parts. A server loop adds hoses and other interfaces; rack distribution and a coolant distribution unit, or CDU, add further responsibilities.
We establish that boundary at the beginning so your procurement team knows what is included and your engineers know where the interfaces are. A custom liquid cooling cold plate can meet its drawing and still be unsuitable for a different loop flow, fluid chemistry or service arrangement. Our proposal ties the component to the conditions it must work within.
In direct-to-chip cooling, heat passes through the processor’s applicable package and thermal interface material, then through the plate to the coolant. The actual contact may be a heat spreader or another platform-approved interface. The coolant remains within the designed fluid circuit; bare-die contact is not implied by the name.
Route CPU and GPU requirements to the right interface review
CPU projects require particular attention to the socket, package, retention hardware, contact height and board keep-outs. GPU projects require the board revision, contact map, surrounding components and mounting arrangement to be reviewed together. For that deeper GPU discussion, see our custom GPU cold plate solutions. This guide covers the shared material, construction and sourcing decisions across the AI-server component family.
Cold plate bodies and carriers sit within our wider aluminum hardware for AI servers scope. A clear part boundary lets the cooling and structural work connect without confusing component supply with the complete facility cooling system.
Why we put aluminum forward—and when to retain a different thermal core
We recommend an aluminum cold plate body when its thermal path and coolant compatibility meet the requirement, and its low mass and integrated geometry improve the assembly. Aluminum is particularly useful when a custom shape must accommodate ports, mounting bosses, surrounding hardware and production machining. These features can be designed together instead of adding multiple adapters to a generic block.
Hydro describes aluminum’s weight and integrated-profile advantages in data-center applications. The relevant takeaway is manufacturing freedom and component weight. Neither the raw material’s conductivity nor its price establishes the finished plate’s thermal performance or total delivered cost.
| Option | BAOSONG recommendation | Pain it addresses | Condition that changes the choice |
|---|---|---|---|
| Aluminum fluid-carrying body | Use as the starting proposal for a suitable fluid system and attainable thermal target. | Excess mass, awkward adapters and a custom envelope that a catalog part does not fit. | Insufficient thermal margin or an incompatible coolant/material specification. |
| Aluminum body with a permanent cover joint | Select when the channel and pressure-boundary design support an appropriate joined construction. | A compact sealed passage arrangement with integrated connections. | Joint access, distortion, cleanliness or process economics make another closure better. |
| Aluminum frame around an approved cooling core | Prefer when retention, installation or structural geometry changes while the core can be retained. | Mechanical adaptation otherwise forcing a change to the fluid path. | New contact loads or thermal conditions also invalidate the retained core. |
| Copper or a purpose-designed mixed construction | Use when the actual thermal bottleneck or approved wetted-material system calls for it. | A specific conduction/contact constraint that the proposed aluminum route cannot meet. | Mass, extra interfaces, joining or corrosion considerations outweigh the local benefit. |
Separate wetted and non-wetted materials on the bill of materials. An external aluminum frame can preserve an existing coolant path. A mixed-metal fluid circuit needs review of the coolant-exposed metals, fillers, coatings, seals and connections as a combination. Boyd’s liquid cold plate data provides examples of construction and fluid choices; it does not approve an unspecified aluminum plate for every water or glycol formulation.
Solve the thermal and mechanical problem together
Our design review starts with the dominant constraint, then changes the features that can actually improve it. A hot device may be limited by its contact stack, local heat spreading or flow distribution. Adding more channels is only helpful when it addresses the limiting part of that path within the available pressure budget.
| What the customer sees | What BAOSONG addresses | How the proposal helps |
|---|---|---|
| A hotspot despite adequate total flow | Align the heat/contact map and channel region using a common orientation and datum. | Places cooling capability at the affected area instead of relying only on average power. |
| Good individual plate result, poor installed performance | Review TIM, mounting, inlet conditions and the plate’s pressure allocation within the server circuit. | Makes the component target consistent with installation conditions. |
| Insufficient room for fittings or maintenance | Integrate ports, connector engagement and tool/hose clearance into the envelope review. | Resolves an installation constraint before the part is released. |
| Contact-face movement after joining | Sequence joining and final machining around the functional datum and finished acceptance state. | Ties dimensional control to the plate that is actually installed. |
| Debris, uncertain sealing or unstable repeat orders | Define closure, cleaning access, final checks, protected ports and revision control in the manufacturing scope. | Turns loosely specified process steps into order requirements. |
Use a thermal budget to decide what to change
For an agreed case-temperature reference, the allowed case-to-inlet thermal resistance can be estimated as the permitted temperature rise divided by heat input. The same reference points must be used when evaluating the plate and its contact stack. This budgeting relationship is useful for screening a design; it does not predict performance without an appropriate thermal model or test.
Illustrative calculation, not a BAOSONG product rating: assume a 75°C case limit, 35°C inlet coolant and 600 W passing through the defined cooling path. The available case-to-inlet resistance is (75 − 35) / 600 = approximately 0.067 K/W. Part of that budget is consumed by the contact interface. We would establish the interface allowance and design margin before allocating the remainder to the cold plate. A die-temperature limit requires the additional package path to be included.
For the component test, record the coolant, flow, inlet temperature, applied heat, contact arrangement and pressure drop together. OCP’s Cold Plate Development and Qualification white paper describes thermal resistance using the component case and incoming fluid temperatures at the measured flow. A rating detached from those conditions is a weak basis for comparing alternatives.
Improve the channel layout without losing the pressure or manufacturing budget
We favor channel features that can be made, cleaned and checked consistently at the required quantities. Narrowing passages may increase local heat-transfer capability but can also raise flow resistance and sensitivity to contamination. Port and header layout matters because the available flow must reach the intended channel regions.
We examine base thickness with the contact span and pressure boundary. Reducing thickness shortens the conduction path, but a thin unsupported region can move under pressure or mounting load. The useful proposal balances local heat removal with contact stability and a manufacturable wall, then identifies how the selected design will be verified.
Make fluid compatibility a construction decision
“Water-glycol” is a starting description, not a complete lifetime specification. Our review identifies the fluid formulation and concentration, operating conditions, exposed materials and the responsible system specification. The same review includes seals, joining materials and any internal treatment.
We do not prescribe internal anodizing as a universal solution. A coating adds its own coverage, adhesion, dimensional and thermal-interface questions. We recommend the surface condition that serves the defined fluid and function, with external appearance requirements kept separate from contact and sealing faces.
Match cold plate manufacturing to geometry and order quantity
Cold plate manufacturing should be selected with the finished assembly and repeat order in view. CNC machining remains a valid production route for complex or variable geometry. Extruded stock or joined internal structures become attractive when their shape, process controls and order economics support the component. There is no useful universal quantity at which every cold plate should change process.
| Route | We recommend considering it for | Decision made before release | Main trade-off |
|---|---|---|---|
| Machined base and sealed cover | Custom channels, ports and mounting geometry; development or repeat production. | Tool access, remaining wall, sealing lands, closure and final inspection state. | Material removal and closure requirements affect recurring cost. |
| Machined body with a welded cover | A permanent closure whose joint path and access suit the component. | Joint design, fixtures, distortion allowance, cleaning and acceptance. | Process access and joint effects can constrain the envelope. |
| Brazed multi-piece construction | Internal passages or fin structures best assembled from compatible elements. | Material/filler system, joint layout, process condition and finished geometry. | Joining consistency, residues and the thermal cycle need control. |
| Extruded channel body with machined interfaces and closures | Repeating straight passage geometry where the section and order plan justify it. | Section feasibility, ends/headers, contact features and closure inspection. | Constant-section geometry limits local changes to the flow field. |
We use precision aluminum CNC machining to connect the proposed construction to its critical functional features. Any proposed near-net, joining or finishing route is assessed with the required final geometry. Changing the stock or closure is a controlled engineering change, not an automatic cost saving.
The quotation separates material and recurring operations from tooling, fixtures, first-article work and change qualification. For a high-volume AI server cold plate project, this lets your team compare a stable production route with a proposed alternative on the same acceptance basis.
Build an acceptance package that matches the purchased item
We define the component’s release evidence with the quotation. If you are ordering machined parts for your own joining process, the inspection scope differs from a sealed assembly. For an approved design, first-article and production checks follow the released requirements. New thermal designs and material changes also need their agreed development and qualification evidence.
| Acceptance area | What the evidence should establish | Responsibility to agree |
|---|---|---|
| Dimensions and interfaces | Contact face, datums, ports, mounting features and the correct final process state. | Component inspection and the buyer’s interface approval. |
| Fluid boundary | Leak acceptance by an agreed method; separate pressure-strength or cycling requirements where specified. | The supplied assembly boundary and the named test provider. |
| Thermal and flow behavior | Performance at the specified contact stack, coolant, inlet condition, heat and flow range. | Component test scope and server integration acceptance. |
| Cleanliness and fluid/material compatibility | Defined cleanliness and protection; compatible production materials and processes under the system specification. | Manufacturing controls, qualification scope and fluid-owner requirements. |
| Repeat supply | Drawing revision, material/lot identity, approved changes and agreed inspection records. | The production and documentation package for each order. |
Our aluminum component inspection planning puts the critical characteristics into the order. Thermal testing, leakage, pressure strength and life address different questions; one result should not be used to imply all the others. System owners also need to manage conditions outside the plate, including coolant supply, condensation limits and service handling. The OCP Cold Plate project maintains separate workstreams for coolant fluids, connections and component requirements.
Why choose BAOSONG for your custom cold plate components?
A recommendation you can act on
Our aluminum part design review turns your current drawing, sample or requirement into a preferred component route, then explains the conditions that would change it. Material, body geometry, closure and mounting are considered together. Your engineering and purchasing teams receive a common proposal rather than separate process suggestions.
Aluminum expertise applied where it improves the product
We look for useful integration in the body, ports, carrier and mounting features. When the cooling core is already fixed, we direct the aluminum work toward the mechanical adaptation. This makes an aluminum solution relevant even when the entire coolant path should not change.
A manufacturing handoff for repeat orders
We connect the approved geometry to the process sequence, critical inspection features and quotation quantities. The agreed revision and acceptance basis carry forward into first articles and repeat supply, and proposed changes are identified before implementation.
For teams sourcing a custom server cold plate from China, the commercial comparison should cover the same delivered assembly, material, acceptance records and order quantities. We make those inclusions visible so a quotation can be evaluated against your actual production requirement.
Get a proposal from the project information you have
| You have | BAOSONG takes the next step | You receive |
|---|---|---|
| A released drawing and quantity | Review manufacturability and the specified delivery/inspection scope. | A quotation basis with deviations or improvements clearly identified. |
| A sample, sketch or photograph | Identify geometry, internal-construction questions and the functional references needed. | A plan to turn the reference into a controlled component specification. |
| A thermal, fit or installation problem | Separate the dominant constraint from the surrounding design decisions. | A recommended material/construction direction and focused next actions. |
| A transfer or repeat-production target | Review the reference part, drawing revision and recurring cost drivers. | A manufacturing, first-article and supply proposal for the requested quantities. |
Request your AI server cold plate proposal and quote. Send a drawing, a sample photo or a short description. We will guide the missing-input review and explain the recommended construction, manufacturing scope and next approval step.
Frequently asked questions
Is aluminum a good choice for an AI server cold plate?
Yes, when its thermal and coolant requirements support the construction. Aluminum offers low mass and considerable freedom to integrate mounting and connection features. We recommend an aluminum body for that combination of benefits, then use the actual heat path and fluid system to confirm the route. An aluminum carrier around a retained core is another useful option.
What is the best channel size?
Start with the local heat map, coolant and available flow and pressure allocation. We recommend practical channel features that deliver the required cooling and can be manufactured, cleaned and inspected consistently. A finer channel is worthwhile only when the thermal benefit survives those constraints.
Should we select single-phase or two-phase cooling?
Keep the architecture specified by the server cooling system and develop the plate for its approved fluid and operating conditions. A two-phase plate is an architecture choice with different circuit requirements, not a drop-in material upgrade. This guide’s illustrative thermal budget addresses a defined single-phase cooling path.
Can an existing plate be adapted to a new server?
First separate mechanical changes from changes to the thermal core. A new bracket or carrier may resolve the fit when contact and operating requirements remain suitable. Changes to the contact map, fluid path or mounting load need a wider review. We identify that boundary before recommending what to retain.
Can we begin with an incomplete specification?
Yes. A project description, sketch or sample photo is enough for the initial discussion. We will identify the key missing decisions and develop the proposal with your team. Production release follows an agreed specification; initial contact does not require you to finish that work alone.
