With single rack power density exceeding 30kW and chip heat flux reaching over 1500W/cm² in AI data centers, traditional air cooling (max heat flux limit ~100W/cm²) can no longer meet heat dissipation demands.
Microchannel cold plates expand heat exchange area by 10 times and deliver 3x higher cooling efficiency than conventional liquid cold plates, reducing GPU temperature rise by 65%. This technology can lower data center PUE below 1.1 with ultra-low thermal resistance down to 0.009℃/W, stably supporting 1400W high-power GPUs. It has become an essential cooling solution for high-density computing hardware.
This article systematically categorizes and compares mainstream microchannel cold plates deployed in data centers from four dimensions: channel structure, cross-section shape, integration level, and manufacturing process. We also provide a quick selection guide for engineering implementation.
| Type | Appearance & Visual Features | Core Structure | Manufacturing Process | Typical Application Scenarios |
|---|---|---|---|---|
| Parallel Straight Microchannel | Copper/aluminum metallic finish, evenly spaced straight uniform grooves | Single/multi-row straight rectangular channels | Precision milling, skiving, extrusion | Standard CPUs, medium-low power GPUs, general liquid-cooled servers, rack cold plates |
| Serpentine / S-shaped Microchannel | Solid metal finish, continuous bent S/loop-shaped channels | Single/multi-channel reciprocating bent layout to extend fluid flow path | Milling, brazing, sheet stamping | High-power GPUs, AI inference cards, single-node high-compute racks |
| Tree / Fractal Microchannel | Clear hierarchical branch texture, Y/H multi-stage diversion mimicking blood vessels | Multi-level Y/H manifold bifurcation for full-area flow distribution | Precision milling, metal 3D printing, diffusion bonding | Supercomputers, 2.5D/3D stacked chips, high-end AI training clusters |
| Micro Pin-fin Array | Dense cylindrical/elliptical/diamond protrusions across surface with strong concave-convex texture | Base substrate covered with dense pin-fins, fluid flows around pillars | Milling, photolithography, 3D printing, electroforming | Ultra-high heat flux chips (>400W/cm²), HBM memory, high-performance compute accelerators |
| Wavy / Corrugated Microchannel | Continuous wave/zigzag channel sidewalls instead of flat straight walls | Straight channels modified with wave/tooth inner walls to boost turbulence | Forming milling, extrusion, molding | Medium-high power chips, compact cold plates, edge computing devices |
| T-type / Cross Split Microchannel | Grid interlaced texture with frequent flow splitting & merging | Periodic bifurcation and convergence of main channels to repeatedly disturb fluid | Milling, multi-layer plate brazing | High-density packaged modules, multi-chip integrated cold plates |
| Cross Section Type | Visual Appearance | Structural Characteristics | Performance & Applicability |
|---|---|---|---|
| Rectangular | Square notches with sharp edges, industry mainstream design | Adjustable aspect ratio, maximum manufacturing compatibility | Balanced overall performance, universal for nearly all commercial cold plates |
| Trapezoidal | Wide top, narrow bottom, inclined side walls | Better fluid adhesion, slightly lower pressure drop than equal-size rectangular channels | Standard server cold plates prioritizing low flow resistance |
| Circular / Elliptical | Smooth rounded inner walls without sharp corners | Minimum flow resistance, no dead vortex zones | Large flow rate, low pressure drop integrated cold plates with pipelines |
| Hexagonal | Honeycomb dense regular layout | Maximum space utilization, strong structural rigidity | Compact modules, embedded microchannels |
| Special Reinforced Profile | Inner walls with convex dots, grooves or streamlined arcs | Active turbulence enhancement for upgraded heat transfer | Custom cold plates dedicated to high-power hardware |
| Integration Tier | Form Factor | Production Method | Thermal Resistance Grade | Core Advantages | Application Positioning |
|---|---|---|---|---|---|
| Independent External Microchannel Cold Plate | Separate metal plate with inlet/outlet ports, detachable standard hardware | Copper/aluminum CNC machining, brazing | Medium | Modular design, easy maintenance & replacement, mature low-cost technology | Existing data center retrofits, general liquid-cooled servers |
| Microchannel Lid (MLCP / Package Level) | Integrated flow channels built into chip IHS, same outline as original standard heat lid | Precision composite machining, diffusion bonding | Low | Eliminates one layer of thermal interface material, shortened heat transfer path | New generation GPU/CPU factory liquid cooling packaging, high-end compute cards |
| Chip-Embedded Microchannel | Micro grooves etched inside silicon wafer/substrate, tiny invisible channels, overall appearance as bare chip | Semiconductor photolithography, deep silicon etching | Ultra-Low | Shortest heat transfer path, direct contact with heat source, ultimate cooling performance | Cutting-edge 3D IC, supercomputer chips, next-gen compute chips (lab & small-batch trial) |
| Fabrication Technology | Material & Surface Color | Surface Texture | Compatible Channel Structures | Cost & Mass Production Capacity |
|---|---|---|---|---|
| Precision Milling / Skiving | Pure copper (red copper tone), aluminum (silvery metallic) | Smooth surface, straight channel walls, standard industrial finish | Straight channels, serpentine, trapezoidal/rectangular cross-sections | Low cost, high mass productivity, most widely adopted industrial process |
| Brazing / Diffusion Bonding | Multi-layer stacked copper/aluminum, silvery grey / red copper tone, seamless joints | Flat plate surface with invisible splicing seams | Multi-layer composite channels, large-format cold plates | Medium cost, ideal for large-area integrated modules |
| Metal 3D Printing | Copper/stainless steel, matte metallic finish, subtle layered printing texture | Visible print layer lines, one-piece forming for complex geometries | Fractal channels, pin-fin arrays, irregular twisted flow paths | High cost, limited to small-batch customized products |
| Silicon Photolithography / Etching | Silicon substrate, silvery mirror finish | Ultra-smooth micron-level precision grooves | Chip-embedded microchannels | Semiconductor wafer process, only for high-end forward-looking applications |
- Standard computer room, cost priority: Parallel straight channels + rectangular cross-section + precision milling process
- High-power AI servers, temperature uniformity priority: Serpentine / wavy microchannels
- Ultra-high heat flux supercomputing scenarios: Pin-fin array / tree fractal microchannels
- New project next-generation chip packaging planning: MLCP integrated microchannel lid
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Parallel Straight Microchannel (Most Common)
Appearance: Copper/aluminum metallic surface, evenly spaced straight uniform grooves
Advantages: Simple fabrication, low pressure drop, uniform fluid distribution
Application: Standard CPUs, regular GPUs, general liquid cooling servers
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Serpentine / S-shaped Microchannel
Appearance: Continuously bent S/loop-shaped connected grooves
Advantages: Larger heat exchange area, uniform chip temperature; downside: higher pressure drop
Application: High-power GPUs, AI inference accelerator cards
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Tree / Fractal Microchannel (Bionic Vascular Design)
Appearance: Multi-stage Y/H branched hierarchical texture
Advantages: Ultra-even flow distribution, few hot spots, minimal temperature difference; downside: complex manufacturing
Application: Supercomputers, 2.5D/3D stacked integrated chips
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Micro Pin-fin Array (Porous Structure)
Appearance: Dense cylindrical/diamond convex pillars with strong concave-convex surface
Advantages: Maximum specific surface area & strongest heat exchange; downside: prone to clogging, high pressure drop
Application: Ultra-high heat flux chips (>400W/cm²), HBM memory, high-performance AI accelerators
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Wavy / Corrugated Microchannel
Appearance: Wave/zigzag irregular channel sidewalls
Advantages: Enhanced fluid turbulence, heat transfer boosted by 20~40%; downside: elevated pressure drop
Application: Medium-high power chips, compact small-size cold plates
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T-type / Cross Split Microchannel
Appearance: Grid staggered layout with repeated flow split & merge
Advantages: Repeatedly breaks thermal boundary layer for low thermal resistance; downside: uneven local flow resistance
Application: High-density packaging, multi-chip integrated cold plates
- Rectangular: Square sharp notches, universal mainstream design
- Trapezoidal: Wide top narrow bottom inclined side walls, low pressure drop standard cold plate
- Circular / Elliptical: Smooth rounded inner wall, low resistance for large flow rate systems
- Hexagonal: Honeycomb dense arrangement, compact embedded modules
- Special Reinforced Profile: Inner convex grooves & streamlined curved surfaces, customized high-power cooling
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Independent External Microchannel Cold Plate
Form: Standalone metal plate with inlet/outlet ports, detachable modular hardware
Advantages: Easy maintenance, mature low-cost technology
Application: Legacy data center retrofits, general liquid cooling servers
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MLCP Package-Level Microchannel Lid
Form: Integrated flow channels inside chip heat spreader, identical outline to standard IHS
Advantages: Removes one thermal interface layer, lower thermal resistance, factory integrated packaging
Application: New generation high-power GPU/CPUs (e.g. NVIDIA Rubin series)
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Chip-Embedded Microchannel
Form: Micron-scale etched grooves inside silicon wafer/substrate, invisible to naked eye
Advantages: Shortest heat transfer path, direct contact with heat source; downside: extremely complex manufacturing
Application: Cutting-edge 3D IC, supercomputer chips, future high-density compute hardware
- Precision Milling / Skiving: Pure copper (red tone) / aluminum (silvery), smooth flat straight channel walls
- Brazing & Diffusion Bonding: Multi-layer copper/aluminum composite, seamless flat plate surface
- Metal 3D Printing: Copper/stainless steel matte finish, visible layered printing texture, one-piece complex channel forming
- Silicon Photolithography Etching: Silvery mirror silicon surface, ultra-fine micron precision internal grooves
