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COMPANY RESEARCH / FLEX

Flex

800 VDC power rack, power shelves, BBUs and liquid cooling

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Where it fits in an AI server rack

Launched an 800 VDC Power Rack developed in collaboration with NVIDIA for the Vera Rubin platform, with a power shelf, battery backup units and capacitor backup units, raising available compute power per rack from about 125 kW to up to 880 kW (Mar 16, 2026); NVIDIA lists Flex among its 800 VDC power-component partners. Its Sept 2026 filing lists power shelves and supplies, vertical power delivery, PDUs, cold plates, rack manifolds and quick disconnects and CDUs; JetCool, a Flex company, sells GPU cold plates and CDUs, and Flex integrates racks.

What the evidence establishes

AI-rack evidence

Disclosed: Flex’s release describes its 800 VDC Power Rack for NVIDIA Vera Rubin, and its Sept 2026 8-K lists power shelves, PDUs, cold plates, manifolds and CDUs; NVIDIA names Flex as an 800 VDC partner.

An explicit AI-server or AI-rack product, design-in, supply role, program, reference design or partnership, such as a part named for rack-scale AI systems or a product sold for AI data centers. For a rack builder, it means the company’s own AI servers or racks. This does not establish revenue, market share, volumes or future sourcing.

Listed as a rack builder for its own AI servers and racks, not as a supplier of the parts inside.

Component role800 VDC power rack, power shelves, BBUs and liquid cooling
EvidenceDisclosed: Flex’s release describes its 800 VDC Power Rack for NVIDIA Vera Rubin, and its Sept 2026 8-K lists power shelves, PDUs, cold plates, manifolds and CDUs; NVIDIA names Flex as an 800 VDC partner.
How we knowDisclosed The company’s own filing, release, annual report, product page or investor record describes the AI-server or AI-rack role. Where customers are unnamed, the listing says so.
Primary sourceFlex — supporting disclosure
Company or official disclosure; vendor claims are attributed to their source.
Checked. This is the research review date, not the source publication or quote time.

Keep in perspective

Flex is a diversified manufacturer and does not break out AI-rack revenue. On Sept 3, 2026 it agreed to acquire EPC Power ($4.4 billion, closing expected Q4 2026) and plans to spin off its Cloud and Power Infrastructure segment as a separate listed company in Q1 2027, which would move much of this exposure to a new ticker.

Diversified business exposure. This describes the breadth or role of the business; it is not an investment rating. An AI-server product, design-in or partnership does not by itself establish material AI-rack revenue, market share, or future returns.

Connections to the assembly

These links explain the technology relationship. The model is illustrative and does not represent an actual manufacturer’s bill of materials.

Power shelf PSUs

Hot-swap rectifier modules of several kilowatts each, grouped in 1U shelves, that turn facility AC into roughly 50 V DC for the busbar.

Scope of the company links: Hot-swap AC-to-DC rectifiers in 1U shelves feeding the busbar at about 50 V. NVIDIA says the GB300 NVL72 power supply, with about half its volume given to capacitors storing 65 J per GPU, was co-designed with Lite-On, and Vertiv sells a 33 kW shelf of six 5.5 kW PSUs for GB200 and GB300. Delta, Flex and Advanced Energy sell AI power shelves and 800 VDC power racks, Megmeet is on NVIDIA’s 800 VDC component list, and Murata reports rising server power-supply sales. TI, onsemi, Infineon, Navitas, Power Integrations, ST and ROHM supply the GaN, SiC and control silicon inside supplies and are named for 800 VDC; which chips sit in a given shelf is not disclosed. Apart from Lite-On’s co-design, shelf suppliers for specific GB200/GB300 deployments are press reports and are not used. AcBel was a candidate but no source was captured. Luxshare lists power shelves for AI racks without naming a program.

Voltage regulators

Multiphase controllers, power stages and 48 V converter modules that step bus voltage down to below one volt at hundreds or thousands of amps, right beside each chip.

Scope of the company links: Multiphase controllers, power stages and 48 V or 800 V bus-converter modules stepping down to under 1 V at the chips. MPS reports stronger sales of power management for AI and server applications and is sampling an 800 V solution; Infineon calls AI data-center power its main growth driver. TI (a 6 V-to-sub-1 V multiphase buck in its 800 VDC architecture), onsemi, Navitas, AOS, Renesas and Analog Devices are on NVIDIA’s 800 VDC silicon lists or have announced 800 VDC work with NVIDIA; Vicor sells 48 V Power-on-Package modules for AI accelerators. Delta (TLVR regulators), Flex (vertical power delivery), Advanced Energy (800 V-to-50 V converters) and Lite-On (power bricks) sell modules. NVIDIA does not say whose power stages sit on a Blackwell board, and press share estimates are not used. Empower (being acquired by ADI) and Claros (being acquired by Navitas) are private; Richtek is a MediaTek subsidiary.

Battery backup & energy storage

Lithium-ion battery backup units and capacitor-based storage that ride through short outages and smooth the sudden power swings of synchronized GPU work.

Scope of the company links: Battery backup units and capacitor storage that ride through outages and smooth load swings. NVIDIA says the GB300 NVL72 power supply stores 65 J per GPU in electrolytic capacitors co-designed with Lite-On, and measured 30% lower peak grid demand with the rack’s smoothing features. Delta (80 kW BBUs embedded in 110 kW shelves; power-capacitance shelves), Flex (BBUs and capacitor backup units in its 800 VDC power rack) and Lite-On (power rack with integrated BBU) sell the units. Samsung SDI and LG Energy Solution market cylindrical cells for BBUs, and Murata reports data-center lithium-ion battery sales without saying they are BBUs. TI’s 800 V capacitor bank is a reference design, and LG’s NVIDIA DSX Ready BESS is facility-scale; neither is mapped.

Rack PDUs

Power distribution units that bring facility AC into the rack through breakers, with metering so operators can see each feed’s load.

Scope of the company links: Rack PDUs bring facility AC into the rack, with metering and breakers. Schneider updated its NetShelter Rack PDU Advanced for AI servers’ higher currents; Vertiv (Geist), Legrand (Raritan, Server Technology) and Delta (rPDUs) sell rack PDUs for AI and high-density data centers, and Flex lists PDUs in its portfolio. None of these sources names the PDU in a specific NVL72 deployment. Eaton’s rack-PDU line was not verified in our September 2026 review and is not mapped. nVent lists rack PDUs beside its liquid-cooling products.

Cold plates

Copper plates with fine internal channels mounted on the GPUs and CPUs. Coolant flowing through the channels carries the chips’ heat away.

Scope of the company links: Cold-plate makers with documented AI-server products: AVC (large-scale AI liquid-cooling production; a reference designer for unnamed leading GPU makers), Motivair by Schneider Electric (cold plates for NVIDIA SXM5 and AMD Instinct MI300X), JetCool, a Flex company (SmartPlate for NVIDIA H100 and RTX PRO 6000 and Broadcom TH6 switches), CoolIT, owned by Ecolab since July 2, 2026 (5+ million cold plates shipped), Auras, Delta (microchannel cold plates), Envicool, Jentech (liquid-cooling modules), SUNON (shipping since 1H 2026) and Forcecon (catalog). Eaton added Boyd Thermal’s cold plates when it closed that purchase (Mar 12, 2026); Supermicro markets its own DLC-2 cold plates; Luxshare lists cold plates for AI racks; Furukawa is adding cold-plate capacity for data-center GPUs from January 2027. The cold-plate supplier in any given NVL72 tray is not disclosed. Cooler Master and ZutaCore are private, and Fositek’s “Cold Plate + UQD” offer relies on AVC, so Fositek is mapped to quick disconnects only.

Rack manifolds

Vertical supply and return pipes at the back of the rack that distribute cool liquid to every tray and collect the warm liquid.

Scope of the company links: Kaori Thermal’s MGX and Vera Rubin rack manifolds are marketed as compliant with NVIDIA’s NVL72 reference designs, and nVent’s manifolds are part of the GB200 NVL72 reference architecture it defined with NVIDIA. Auras (rack, AI and internal manifolds), AVC (manifold systems), Envicool, Delta, Motivair by Schneider Electric (in-rack manifolds), CoolIT (Ecolab), JetCool (Flex), Nidec (coolant distribution manifolds) and Forcecon (catalog) also document manifolds. NVIDIA’s GB200 NVL72 design uses a blind-mate liquid-cooling manifold (NVIDIA, Oct 2024); which supplier builds it for a given rack is not disclosed. Eaton (Boyd Thermal), Supermicro and Luxshare also list rack manifolds for liquid-cooled AI racks.

Quick disconnects

Dripless couplings at each tray connection. They seal both sides when unplugged, so a tray can be removed without draining the loop.

Scope of the company links: Fositek says its UQDs entered the GB200/GB300 supply chain and passed Rubin testing (2025 annual report); Envicool says NVIDIA listed its UQDs (OCP 2024) and its UQDs and MQDs (OCP 2025) among MGX ecosystem partners; Auras shows quick disconnects in its AI liquid-cooling line-up; Amphenol markets UQD, UQDB, BMQC and MQD couplings for AI data-center liquid cooling; Dover’s CPC is an NVIDIA-named Blackwell partner and Dover’s 10-K cites connectors for liquid cooling of server racks; JetCool (Flex) offers manifolds and quick disconnects. Parker was not verified as a quick-disconnect supplier in our sources, and Nidec’s quick couplings are made for its own CDUs. Stäubli and Danfoss, both NVIDIA-named, are private. Luxshare lists blind-mate quick connectors for AI racks.

Coolant distribution unit

Pumps, a heat exchanger, filters and controls that circulate the rack’s clean coolant and pass its heat to the building’s water loop.

Scope of the company links: In-rack CDUs like the illustrated one sit at the bottom of the rack: Kaori (4U in-rack CDU), Auras, SUNON (in-rack RPU/CDU, mass-production ready in 1H 2026), JetCool (Flex; SmartSense rack-mounted CDU), Envicool (rack CDU validated by Intel) and Forcecon (80 kW, catalog). Row- and facility-scale CDUs serve many racks: nVent (in its GB200 NVL72 reference architecture with NVIDIA), Delta (40–144 kW liquid-to-air; 1.5 MW liquid-to-liquid), Motivair by Schneider Electric (MCDU-70 in the Schneider–AMD Helios reference design; WCDU up to 3.5 MW), CoolIT (Ecolab), Vertiv (Liebert XDU), AVC, Nidec, Modine’s Airedale (400 kW–2 MW+) and Lite-On (a 600 kW in-row CDU announced in 2024). Sanyo Denki supplies a liquid-cooling pump, a CDU component rather than a CDU. LiquidStack is private. Eaton’s Boyd Thermal markets CDUs for GB200 NVL72 deployments, Supermicro’s GB300 NVL72 rack carries its own in-rack CDU of up to 250 kW, and Luxshare lists CDUs.

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