HPE (Hewlett Packard Enterprise)

Server OEM behind the Cray EX lineage and a 100% fanless direct liquid cooling architecture that covers eight elements, from blade and network fabric to rack and CDU. HPE says it cuts cooling power per blade by 37% against hybrid DLC.

CDU, Cold plate, Server OEM HQ Houston, Texas, USA Checked 9 Nov 2026

Smallest CDU: 75 kW HPE Cray 1-phase 75kW in-rack coolant distribution unit data sheet, 9 Nov 2026
Largest CDU: 1,600 kW HPE Cray Supercomputing EX 3-phase 1.6MW floor v2 CDU (S3P13A), 9 Nov 2026

Rating conditions

Ratings are the capacities in HPE's own product names: HPE Cray 1-phase 75 kW in-rack CDU, HPE Cray 270 kW top- and bottom-feed CDUs, and the HPE Cray Supercomputing EX 1.6 MW floor CDU (SKU S3P13A, NA and EU variants). HPE publishes no approach temperature with them.

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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.: CDU, 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.: 75 4
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.: 1,600 3
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.: Not published
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, In-row 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.: Not published
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.: Not published
HQ region Region of the vendor's (or brand owner's) headquarters.: North America 1
HQ country Country of the vendor's (or brand owner's) headquarters.: United States 1
Headquarters Headquarters city and country as the vendor states it.: Houston, Texas, USA 1
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.: 100% fanless DLC architecture, HPE Cray EX liquid-cooled cabinets, HPE Cray 75 kW in-rack CDU, 270 kW top/bottom-feed CDUs, 1.6 MW floor CDU 1
Spec notes Rating conditions behind the numbers (approach temperature, water temperature, fluid), conflicting figures, and prototypes left out of the ranges.: Ratings are the capacities in HPE's own product names: HPE Cray 1-phase 75 kW in-rack CDU, HPE Cray 270 kW top- and bottom-feed CDUs, and the HPE Cray Supercomputing EX 1.6 MW floor CDU (SKU S3P13A, NA and EU variants). HPE publishes no approach temperature with them. 1

Sources

HPE direct liquid cooling solutions accessed 2026-11-09
HPE 100% fanless DLC architecture release (Oct 2024) accessed 2026-11-09
HPE Cray Supercomputing EX 3-phase 1.6MW floor v2 CDU (S3P13A) accessed 2026-11-09
HPE Cray 1-phase 75kW in-rack coolant distribution unit data sheet accessed 2026-11-09

HPE alternatives

Largest CDU

Chilldyne 1,500 kW1
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Rittal 1,500 kW2
JetCool (Flex) 1,800 kW1
LiquidStack 1,350 kW1
Nidec 2,000 kW1

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