The GB200 liquid cooling plate from ToneCooling is a vacuum-brazed copper direct-to-chip cold plate engineered for NVIDIA’s Grace Blackwell GB200 Superchip and the GB200 NVL72 rack platform. Each assembly is rated for over 2.7 kW of supported load at a 25 C inlet, 2.5 L/min flow rate, and is leak tested to 8.7 bar. We manufacture this NVIDIA GB200 cold plate in our ISO 9001 certified facility, ship prototypes in 7-15 days at MOQ 5 pcs, and support OEM customisation of port location, manifold integration, and surface finish.
Why the NVIDIA GB200 Superchip Demands a Liquid Cooling Plate
The NVIDIA GB200 NVL72 platform packs 72 Blackwell GPUs and 36 Grace CPUs into a single rack, drawing roughly 120 kW. Air cooling cannot evacuate this heat density – the thermal envelope of a single Grace Blackwell module is well into the multi-kilowatt range, and rack-level heat flux routinely surpasses what hot-aisle containment can move. A purpose-built GB200 liquid cooling plate mounts directly on the Grace Blackwell package, capturing heat at the source and transporting it to a coolant distribution unit (CDU) loop running 50/50 ethylene-glycol-water per ASHRAE TC 9.9 W45/W55 guidelines.
GB200 Liquid Cooling Plate Specifications
- Compatible package: NVIDIA GB200 Grace Blackwell Superchip (2x Blackwell GPU + 1x Grace CPU), GB200 NVL72 compute tray
- Supported load: > 2.7 kW per assembly
- Reference operating point: 25 C inlet, 2.5 L/min pure water
- Pressure drop target: ~ 35 kPa at the reference flow rate
- Construction: Vacuum-brazed copper C1100 (purple copper T2) with skived/brazed micro-channel array
- Coolant: 50/50 EGW, PG25, deionised water, or pure water (per Open Compute Project Cooling Environments spec)
- Pressure rating: 0.6 MPa working, leak tested to 8.7 bar; helium leak tested where required
- Ports: G1/4 BSPP standard, custom manifold and quick-disconnect options available
- Standards: Manufactured under ISO 9001:2015, RoHS compliant
Vacuum-Brazed Copper Micro-Channel Construction
The performance of any GB200 cold plate is dominated by its internal channel geometry. ToneCooling’s GB200 liquid cooling plate uses purple copper T2 (391 W/m.K thermal conductivity) and a skived/brazed micro-channel array. The thin fin walls maximise surface area per unit volume while keeping pressure drop near the 35 kPa target at the 2.5 L/min nominal flow rate that NVL72 CDU loops are designed for. We vacuum-braze the fin stack to the base plate in our brazing furnace, eliminating the bond line resistance that limits epoxy- or solder-bonded plates. The result is a flat, low-resistance thermal path from the Grace Blackwell die straight into the coolant.
GB200 NVL72 Rack Integration and OEM Customisation
A standalone cold plate is only useful if it integrates cleanly into a rack manifold loop. ToneCooling supports OEMs building GB200 NVL72 liquid cooling trays with custom port positions, integrated manifolds, dripless quick disconnects, and matched flow distribution across multiple compute trays. We provide CFD flow simulation and pressure-drop curves for the complete rack loop before tooling, and we PPAP-document each design revision for hyperscale and OEM qualification. Compared to a generic Grace Blackwell cold plate, a co-engineered design typically reduces inlet-to-outlet temperature rise by 2 – 4 C and recovers 5 – 10 % of rack-level cooling headroom.
Lead Time, MOQ, and Pricing for the GB200 Liquid Cooling Plate
- Prototype: MOQ 5 pcs, 7 – 15 business days from confirmed drawing
- Production: MOQ 50 pcs, 4 – 6 weeks depending on volume
- Indicative pricing: USD 80 – 220 per unit at production volume; prototype quote within 48 hours
- Documentation: Free CFD review, pressure-drop curve, and material certificates included
- Shipping: Worldwide air freight from Shenzhen, full export documentation for US/EU customs
Coolant Compatibility and Long-Term Reliability
The ToneCooling GB200 liquid cooling plate is qualified with the coolant families used by hyperscale operators today: 50/50 ethylene glycol-water (EGW), propylene glycol PG25, deionised water, and pure water at the validation point printed on the data sheet. Every plate is leak tested at 8.7 bar (0.6 MPa rating) and pressure cycled before shipping. We use copper C1100 / T2 throughout the wetted path so there is no galvanic mismatch with copper manifolds, and we offer optional electroless nickel plating for sites running mixed-metal CDU loops or aggressive water chemistry.
How ToneCooling Compares to Generic GB200 Cold Plate Suppliers
Most off-the-shelf GB200 superchip cooling products are repurposed CPU plates with adapter brackets. They miss the dual-die hot-spot pattern of the Grace Blackwell package, leaving thermal headroom on the table. Our GB200 cold plate is designed from a CFD model of the actual GB200 die map, with channel pitch tuned to the hot-spot distribution. The result is uniform die temperature across the package, longer GPU boost clock residency, and measurable gains on training throughput at the rack level.
For complementary platforms, see our liquid cold plate catalogue, the dedicated CPU cold plate range, and our data centre cooling overview. If you need a quote for the GB200 liquid cooling plate or a custom GB200 NVL72 manifold assembly, request a quote and our engineering team will respond within one business day.
Author: ToneCooling Engineering Team. Last Updated: 2026-04-10.
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✓ ISO 9001 Certified | ✓ MOQ 5 pcs | ✓ Prototype in 4–6 weeks | ✓ NDA Available
