Thermal Product Categories for High-Density, High-Power, and AI Server Cooling
ToneCooling is a custom liquid cold plate and thermal solutions manufacturer serving AI server, EV battery, power electronics, telecom, and industrial OEMs across North America, Europe, and Asia-Pacific. Every category on this page is backed by in-house CFD simulation, bench test data, and production tooling at our Huizhou facility.
Which thermal category fits your workload?
In practice most OEM engineers know two numbers on day one: the device dissipation (watts) and the footprint (cm²). Divide the first by the second to get heat flux, then use the right-hand column to narrow the category. If the environment is already fixed — rack-level AI, EV traction pack, IGBT cabinet — the left-hand column will point to the same conclusion in a single click.
By Application
By Heat Flux & Power Density
ToneCooling thermal product categories
Liquid Cold Plate
Flat-plate water-cooled structures that transfer heat from flat or mounted devices into a coolant stream. The baseline for >30 W/cm² workloads.
- Thermal resistance0.02–0.08 K/W
- Pressure drop2–100 kPa
- ProcessesFSW · Brazed · CNC
- MaterialsAL6061 · AL3003 · Cu · AlSiC
Heat Sink
Extruded, skived, stamped, or heat-pipe-stack aluminum or copper structures that shed heat into forced or natural air streams.
- Thermal resistance0.1–1.0 °C/W
- Air velocity0–5 m/s
- ProcessesExtrusion · Skived · Heat-pipe stack
- MaterialsAL6063 · Cu · Cu-plated Al
CPU / GPU Cold Plate
High-performance cold plate subclass tuned for 300–1,000 W silicon packages with micro-channel or skived-fin architectures.
- Per-die dissipation300–1,000 W
- Thermal resistance0.02–0.04 K/W
- Channel width0.1–1.5 mm
- MountDirect-to-die · TIM2 · IHS
Battery Cold Plate
Serpentine, harmonica, stamped, and vacuum-brazed plates tailored to prismatic, pouch, and cylindrical cell packs at 50–500 kW pack scale.
- Pack rating50–500 kW
- Channel geometrySerpentine · Diamond · I-flow
- Join processVacuum brazed · FSW
- Working fluid50% EG · PG · dielectric
Vapor Chamber
Ultra-thin two-phase spreaders (0.35–3 mm) that smooth concentrated heat sources over larger fin areas via internal wick evaporation.
- Thickness0.35–3 mm
- Spread flux10–80 W/cm²
- WickMesh · Sintered powder · Groove
- OrientationAny (wick-dependent)
Coolserver Platform
Rack-level liquid cooling kit: CDU + manifold + cold plate set pre-integrated for 30–150 kW/rack data-center deployments.
- Rack density30–150 kW
- Supply tempW32 / W40 ASHRAE
- IntegrationIn-row CDU · rear-door · direct-to-chip
- CertificationIntertek / TÜV test-ready
Engineering Parameters Master Table
Direct answer: Use this table to match heat flux, flow/air-velocity envelope, and target thermal resistance to the right category before RFQ.
Every parameter envelope below is set by ToneCooling production tooling, validated by in-house CFD and dyno bench testing. Use the heat-flux column as the first filter: if your device dissipation per unit contact area sits above the upper range for a category, escalate to the next category or request a hybrid design review. Pressure drop is reported at the listed flow rate with DI water or the specified coolant; for 50% ethylene glycol, multiply by 1.4–1.6 at the same volumetric flow.
| Category | Typical workload | Heat flux range | Thermal resistance (typ.) | Flow / air velocity | Pressure drop | Materials | Lead time |
|---|---|---|---|---|---|---|---|
| Liquid Cold Plate | 1 – 40 kW / plate | 30 – 500 W/cm² | 0.02 – 0.08 K/W | 1 – 40 L/min | 2 – 100 kPa | AL6061 · AL3003 · Cu · AlSiC | Proto 3–4 wk · Prod 6–10 wk |
| Heat Sink (air-cooled) | 10 – 600 W | < 30 W/cm² | 0.1 – 1.0 °C/W | 1 – 5 m/s | 10 – 150 Pa | AL6063 · Cu heat-pipe stack · skived Cu | Proto 2–3 wk · Prod 4–6 wk |
| CPU / GPU Cold Plate | 300 – 1,000 W / die | 50 – 500 W/cm² | 0.015 – 0.04 K/W | 0.5 – 3 L/min | 8 – 60 kPa | Cu skived · brazed Cu · micro-channel | Proto 3–4 wk · Prod 8–10 wk |
| Battery Cold Plate | 50 – 500 kW pack | 1 – 20 W/cm² | 0.03 – 0.10 K/W | 5 – 30 L/min | 5 – 80 kPa | AL6063 diamond · AL3003 brazed · FSW | Proto 3–5 wk · Prod 8–12 wk |
| Vapor Chamber | 20 – 400 W local | 10 – 80 W/cm² | 0.05 – 0.3 K/W (spreading) | Passive (two-phase) | N/A | Cu envelope · sintered wick · DI water | Proto 4–6 wk · Prod 8–10 wk |
| Coolserver (rack kit) | 30 – 150 kW / rack | System-level | Node Δ 3–7 °C over supply | CDU 80–400 L/min | Loop 80–250 kPa | Full kit: CDU + manifold + cold plate | Deploy 8–12 wk |
Values represent ToneCooling typical engineering envelopes. Project-specific RFQ may target stricter ranges; see proprietary case data below for measured outcomes.
Proprietary Performance Data — ToneCooling Tested
Direct answer: Every datapoint below is from ToneCooling internal CFD simulation or bench test on production tooling — not catalog estimates.
The seven engineering cases below cover the full range of silicon, battery, power-electronics, laser, and air-cooled hardware we ship today. All simulations use measured material properties (thermal conductivity, wall roughness, fluid viscosity as a function of temperature) and are corrected against bench data when a physical sample is available. Heat-source boundary conditions reflect the customer's actual die layout rather than lumped values, so transient peaks and hot-spot migration are captured honestly. We publish these numbers so thermal engineers can benchmark our envelope before sending an RFQ.
GB200 2.7 kW assembly, Cu T2 pair · <43 °C plate surface
- Target platformNVIDIA GB200 (Grace + 2 × B200)
- Heat dissipation1,200 W + 1,200 W + 300 W (2.7 kW)
- MaterialPurple copper T2
- WeldingN₂-protected brazing + laser welding
- Inlet25 ± 2 °C · 2.5 L/min · pure water
- Pressure rating0.6 MPa (leak tested 8.7 bar)
- ΔP @ 2.5 L/min35 ± 5 kPa
- Plate Tmax< 43 °C
Source: ToneCooling production · NVIDIA GB200 direct-to-chip kit (235 × 190 × 30 mm)
GB300 Grace + Blackwell direct-to-die pair, six-point QA certification
- Target platformNVIDIA GB300 (Grace ARM + B300 Blackwell Ultra)
- ConstructionCu direct-to-die skived micro-channel + QD
- Sample size40 units (25 GPU + 14 CPU) · Nov 2025
- TestsUltrasonic · Air leak · ΔP · Thermal · Helium · Flatness
- Ultrasonic weld rate≥ 85 % (ring seal ≥ 0.6 mm)
- ΔP @ 1.5 L/min (GPU)38.7 – 39.9 kPa
- Helium leak tightest3.86 × 10⁻⁹ Pa·m³/s
- Batch pass rate100 % (40 / 40)
Source: ToneCooling production QA · GB300 direct-to-die cold-plate batch Nov 2025
H200 12-device rack set, 6.18 kW total · GPU + Switch cold plates
- Target platformNVIDIA H200 HGX rack (8 GPU + 4 Switch ASIC)
- Heat dissipation8 × 700 W + 2 × 134 W + 2 × 156 W (6.18 kW)
- MaterialPurple copper T2
- WeldingContinuous N₂ tunnel-furnace brazing
- Inlet38 °C · 8 LPM · pure water
- Pressure rating0.8 MPa
- ΔP18.5 ± 3.7 kPa
- Plate Tmax< 65 °C
Source: ToneCooling production · NVIDIA H200 rack-level kit (GPU 151 × 78.2 × 43.14 mm · Switch 80 × 64.3 × 7.6 mm)
Intel Xeon Birch Stream 500 W cold plate, 5 kPa low-ΔP design
- Target platformIntel Xeon 6 Birch Stream (6th-gen server CPU)
- Heat dissipation500 W
- MaterialPurple copper T2
- WeldingInstantaneous Liquid Phase Diffusion Welding
- Inlet40 °C · 1 LPM · 25 % EGW
- Pressure rating1 MPa
- ΔP5 kPa (ultra low)
- Plate Tmax60 °C
Source: ToneCooling production · Intel Xeon Birch Stream cold plate (130 × 90 × 25 mm)
AMD EPYC SP5 dual-CPU cold plate pair, < 3 kPa ΔP
- Target platformAMD EPYC 9005 / 9004 series (SP5 socket)
- Heat dissipation550 W × 2 = 1,100 W per pair
- MaterialPurple copper T2
- WeldingInstantaneous Liquid Phase Diffusion Welding
- Inlet42 °C · 1 L/min · 25 % EGW
- Pressure rating0.6 MPa
- ΔP< 3 kPa (lowest in lineup)
- Plate Tmax< 52 °C
Source: ToneCooling production · AMD EPYC SP5 dual-CPU cold plate (118 × 92.4 × 25 mm)
Diamond-channel AL6063, 6-module pack
- Workload6 × 369 W rated / 1,228 W peak transient
- MaterialAL6063 diamond channel
- Working fluid50% ethylene glycol
- Flow rate15 L/min
- Inlet65 °C
- Tmax steady77.07 °C
- Tmax 1-min peak101.03 °C
Source: ToneCooling CFD · 4-channel geometry sweep
10 kW IGBT bank, AL6061-T6 brazed
- Workload2 × plate × 4 IGBT = 10,000 W
- MaterialAL6061-T6 vacuum brazed
- Working fluidWater
- Flow rate40 L/min
- Ambient55 °C
- Tmax55.38 °C
- ΔP0.104 MPa
Source: ToneCooling CFD · 5-flow-rate sweep
1.2 kW laser, AL6061-T6 + DI water
- Workload1,200 W
- MaterialAL6061-T6
- Working fluidDeionized water
- Flow rate10 L/min
- Ambient25 °C
- Plate Tmax31.34 °C
- ΔP23.5 kPa
Source: ToneCooling CFD · Laser module study
6-IGBT rail traction cold plate
- Workload6 × IGBT modules
- Working fluid50% ethylene glycol
- Flow rate20 L/min
- Ambient45 °C
- IGBT case Tmax75.56 °C
Source: ToneCooling CFD · 4-condition sweep
8-device FSW cold plate, 85 °C ambient
- Workload8 × power devices
- Join processFriction stir welding (FSW)
- Working fluid25% ethylene glycol
- Flow rate1 L/min
- Inlet / Ambient60 °C / 85 °C
- Case Tmax64.95 °C
- ΔP229 Pa
Source: ToneCooling CFD · Automotive IVI/host cold plate
Selected OEM Projects (Anonymized)
Direct answer: Three representative production programs where ToneCooling delivered measurable thermal gains versus baseline reference designs.
Customer names are withheld under mutual NDA, but the hardware is in production today. Each project entered ToneCooling as a failing or marginal baseline and exited with a validated CFD report, a DFM drawing pack, and a production PPAP-ready process plan. The engineering loop — requirements, geometry sweep, thermal simulation, bench validation, tooling release — typically runs four to eight weeks before prototype shipment.
85 °C ambient FSW cold plate cleared first-shot SPEC
Challenge: 8-device host computer with 85 °C ambient and 1 L/min glycol flow — baseline brazed plate exceeded 85 °C case target.
Solution: Friction-stir-welded AL6061 cold plate with optimized serpentine channel and port placement.
Result: Case Tmax 64.95 °C (20 °C margin) · ΔP 229 Pa · single CFD iteration to validation.
Diamond AL6063 channel cut 14 °C peak vs ADC12 baseline
Challenge: 6 × 369 W rated modules with 1,228 W 1-minute transient at 65 °C inlet — baseline ADC12 harmonica plate exceeded 115 °C transient ceiling.
Solution: Four-geometry CFD sweep (I-flow, Z-flow, serpentine, diamond) selected diamond AL6063 brazed construction.
Result: Transient Tmax 101.03 °C · steady 77.07 °C · −14 °C vs baseline.
10 kW IGBT bank: 5-flow sweep nailed 40 L/min optimum
Challenge: 8 IGBT modules at 10 kW total dissipation with 55 °C ambient — water flow budget contested between pump-power and thermal target.
Solution: AL6061-T6 brazed cold plate pair, 5-point flow-rate sweep (10 / 20 / 30 / 40 / 50 L/min) with ΔP and Tmax tradeoff analysis.
Result: 40 L/min operating point locked · Tmax 55.38 °C · ΔP 0.104 MPa · pump oversized by one size for margin.
Applications We Engineer For
Direct answer: Six production-validated verticals where ToneCooling ships custom thermal hardware today.
Each application has its own thermal signature: AI training stacks dissipate concentrated wattage per die, EV battery packs demand cell-level uniformity within 5 °C across the module, IGBT banks tolerate higher case temperature but need aggressive pressure-drop control, and optical modules require steady-state temperature stability within a degree. The six links below open to dedicated application hubs with workload profiles, validation targets, and representative cold-plate geometries.
AI Training & HPC Clusters
Cold-plate sets for 2.7 kW/node direct-to-chip loops and CDU-integrated rack kits.
CPU / GPU Direct-to-Die
Skived, brazed, and micro-channel plates engineered for 300–1,000 W silicon.
EV Battery & ESS Packs
Serpentine, diamond, stamped, and vacuum-brazed plates for 50–500 kW packs.
IGBT / SiC Power Conversion
Water- and glycol-cooled plates for rail, industrial drives, solar inverters.
Optical / Laser / Telecom
DI-water plates and heat-pipe heat sinks for 1 – 10 kW laser and 400G optics.
Industrial Equipment
Custom cold plates for test, semi-fab, welding, and MRI gradient amplifiers.
Design Resources & Internal Hubs
Direct answer: Jump straight to the category archive, the engineering guide, or the application hub closest to your program.
By Category
Design Resources
FAQ — Category Selection & Engineering
Which cooling category is best for >500 W/cm² chip-level heat flux?
Direct answer: Direct-contact or micro-channel liquid cold plates are the only category that reliably handles >500 W/cm². ToneCooling ships micro-channel cold plates down to 0.1 mm channel width and thermal resistance below 0.03 K/W, validated against AI-training silicon and laser-diode stacks.
Liquid cold plate vs heat sink — when to switch?
Direct answer: Switch from heat sink to liquid cold plate when heat flux exceeds ≈30 W/cm² or total pack density exceeds ≈25 kW/m³. Below those thresholds, air-cooled heat sinks remain lower-cost and lower-risk. Between 30–80 W/cm², a heat-pipe-assisted sink can still work if airflow and fin mass are sufficient; above 80 W/cm², liquid is practically mandatory.
Can ToneCooling match both FSW and vacuum-brazed cold plate specifications?
Direct answer: Yes. ToneCooling operates FSW, vacuum brazing, CNC, skived-fin, and stamping lines in-house. The automotive case on this page used FSW (AL6061, ΔP 229 Pa); the 10 kW industrial IGBT case used vacuum-brazed AL6061-T6 (ΔP 0.104 MPa). Process selection is driven by pressure-rating, sealing class, geometry complexity, and production volume.
What working fluids does ToneCooling validate cold plates for?
Direct answer: Standard validation fluids include deionized water, 20–50% ethylene glycol, propylene glycol, and 3M Novec dielectrics. Pressure-drop curves, material-compatibility charts, and corrosion-budget assumptions are available on request with a signed NDA.
What are typical MOQ and lead times?
Direct answer: Prototypes ship in 3–4 weeks at 5–10 units per geometry. Production MOQ is typically 200 pieces with 6–10 week lead time depending on vacuum-brazing furnace load and FSW fixture availability. For rack-level Coolserver kits, deployment lead time is 8–12 weeks including CDU sourcing.
Does ToneCooling provide CFD reports and bench data with RFQ?
Direct answer: Yes. Every RFQ above 50 units includes a sealed CFD report with temperature fields, flow paths, and pressure-drop curves; bench-test correlation data is provided when a prototype has been built. Full test reports follow ISO/IEC 17025 principles: traceable instruments, documented methodology, and repeatable conditions. Customers can request raw mesh files and boundary conditions for independent verification under NDA.
Ready to move from data to design?
Request an engineering quote — our thermal engineering team returns RFQs within 24 hours with a preliminary thermal resistance and pressure-drop envelope.
