Lenovo Neptune

Lenovo's direct water cooling for ThinkSystem servers, running on coolant up to about 45°C so sites can drop chillers. Lenovo reports a PUE of 1.1 on the ThinkSystem SR780a.

Cold plate, Server OEM HQ Beijing, China and Morrisville, North Carolina, USA Owned by Lenovo Checked 9 Nov 2026

Max per rack: 135 kW Lenovo Press: Lenovo NVIDIA GB300 NVL72 rack-scale AI (LP2357), 9 Nov 2026

Rating conditions

Inlet up to ~45°C. Up to 100% heat removal depending on environment and water conditions (vendor datasheets). GB300 NVL72 rack: 135 kW TDP, up to 155 kW peak, about 90% of heat to liquid, DI water or PG25 at 25–45°C supply. Lenovo connects the rack to in-rack or in-row CDU options but publishes no CDU kW rating.

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Datasheet

Source on every value

Technologies Liquid cooling product types the vendor sells today. 'Liquid-to-air CDU' is a sidecar unit or heat dissipation unit that needs no facility water. 'Two-phase cold plate' boils a refrigerant or dielectric on the chip.: Cold plate, Server OEM 1
Smallest CDU kW Rated cooling capacity of the smallest shipping CDU in the line, as the vendor publishes it. Rating conditions (approach temperature, fluid) are in the spec notes. Blank when not published.: Not published
Largest CDU kW Rated cooling capacity of the largest shipping CDU, as the vendor publishes it. Prototypes and announced-only units are left out and named in the spec notes. Blank when not published.: Not published
GPU platforms (vendor-stated) GPU or rack platforms the vendor itself names as supported, certified or targeted, such as NVIDIA GB200 NVL72 or Vera Rubin. Vendor statements only, each with a source. Blank when the vendor names none.: NVIDIA GB300 NVL72 (Lenovo rack-scale system) 3
Level Where the products sit: in the server, in the rack, in the row, or at facility scale (skid or facility distribution unit).: Server, In-rack 1
Coolant Coolant on the IT side: water-glycol (PG25 and similar), single-phase dielectric (oils, GTL, synthetic hydrocarbons) or two-phase dielectric or refrigerant.: Water-glycol 1
Max per rack kW Highest rack density the vendor publishes for its own system (immersion tank, in-rack CDU, rear door or OEM rack). Filled only when the vendor states a per-rack figure.: 135 3
Rear door max kW Highest published heat removal of the vendor's rear-door heat exchanger, per rack.: Not published
Vendor type Liquid cooling specialist, thermal and HVAC major, power and data center infrastructure major, server OEM, component maker (cold plates, connectors, CDUs sold to OEMs) or fluid supplier.: Server OEM 1
Parent company Owner or controlling shareholder when the vendor sits inside a larger group, such as CoolIT under Ecolab or Motivair under Schneider Electric.: Lenovo 1
HQ region Region of the vendor's (or brand owner's) headquarters.: Asia-Pacific 4
HQ country Country of the vendor's (or brand owner's) headquarters.: China 4
Headquarters Headquarters city and country as the vendor states it.: Beijing, China and Morrisville, North Carolina, USA 4
Manufacturing Regions or sites where the vendor says it builds liquid cooling products. Blank when not published.: Not published
Key products Main product lines and model names for data center liquid cooling.: Neptune direct water cooling (ThinkSystem SR780a and others) 1
Spec notes Rating conditions behind the numbers (approach temperature, water temperature, fluid), conflicting figures, and prototypes left out of the ranges.: Inlet up to ~45°C. Up to 100% heat removal depending on environment and water conditions (vendor datasheets). GB300 NVL72 rack: 135 kW TDP, up to 155 kW peak, about 90% of heat to liquid, DI water or PG25 at 25–45°C supply. Lenovo connects the rack to in-rack or in-row CDU options but publishes no CDU kW rating. 1

Sources

Lenovo Neptune accessed 2026-11-09
Lenovo Neptune release (Nov 2025, 45°C, PUE 1.1) accessed 2026-11-09
Lenovo Press: Lenovo NVIDIA GB300 NVL72 rack-scale AI (LP2357) accessed 2026-11-09
Lenovo locations accessed 2026-11-09

Lenovo Neptune alternatives

Largest CDU

Supermicro 5,000 kW1
CoolIT Systems 3,000 kW1
Cooler Master 2,500 kW1
Motivair by Schneider Electric 2,500 kW1
Boyd Thermal (Eaton) 2,300 kW3
ZutaCore 2,000 kW1

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