B300 suppliers: a sourcing guide for rental and hardware

Published 22 October 2026

Searching for B300 suppliers can mean renting GPU capacity, buying servers or finding a channel partner. Start by choosing which of those you need. A server shipment announcement is not a cloud reservation, and a cloud product page does not confirm a connected allocation in your region.

Public sources checked 22 October 2026. This is a research starting point, not an exhaustive directory or ranking. The entries below describe public supplier statements. Inclusion does not establish a RackShore partnership, reseller authorization, available allocation, negotiated rate or delivery commitment.

Public supplier starting points

“Current” below means the supplier publicly describes a product as available or shipping. It does not mean RackShore has verified stock, tested the service or reserved capacity. “Planned” would mean an announcement of future delivery. “Unknown” means the cited source does not confirm the specific requirement. Do not turn planned or unknown capacity into a confirmed offer.

CoreWeave: cloud capacity

Public status: current product announcement. CoreWeave announced general availability of NVIDIA HGX B300 on 16 March 2026. Its product material describes cloud infrastructure and inter-node fabrics. Requirement status: unknown for your region, connected node count, start date and term until confirmed in a specific offer. CoreWeave's B300 announcement

Ask which configuration and fabric the proposed allocation uses, whether all nodes are delivered together, and which storage, orchestration and support services the quote includes.

Nebius: cloud capacity

Public status: current product page. Nebius describes HGX B300 as deployed in production, with self-service instances and a sales route for large reserved allocations. Requirement status: unknown for a particular location, quota, connected cluster and delivery window; self-service product access does not establish that a large reservation is obtainable. Nebius HGX B300 product page

For a distributed workload, request a named region, a single connected allocation, the relevant topology and tests covering the scale proposed in the offer.

TD SYNNEX with Nebius: a channel route

Public status: current announced offering. TD SYNNEX announced dedicated HGX B300 clusters on Nebius AI Cloud on 16 April 2026, delivered through its partner ecosystem; Nebius operates the underlying infrastructure. This is a channel route to Nebius infrastructure, not evidence of a separate independent pool. Requirement status: unknown for your eligibility, contracting route, allocation and start date. TD SYNNEX announcement

Identify the actual seller, operator and support owner. If two proposals ultimately rely on the same capacity, do not count them as independent fallback supply.

Supermicro: hardware systems

Public status: shipment announcement. Supermicro announced shipment availability of 4U and 2-OU liquid-cooled HGX B300 systems on 9 December 2025. This concerns hardware systems rather than a cloud rental allocation. Requirement status: unknown for present stock, lead time, destination, installation and site readiness. Supermicro shipment announcement

For a purchase, obtain an exact bill of materials, delivery terms, warranty and installation scope. Establish who supplies power, cooling, networking and ongoing operations. A shipment date and a workload-ready date are different milestones.

Confirm the exact B300 platform

Do not treat HGX B300, DGX B300 and GB300 NVL72 as interchangeable offers. NVIDIA documents DGX B300 as eight B300 GPUs, while GB300 NVL72 combines 72 Blackwell Ultra GPUs with Grace CPUs in a rack-scale design. Confirm the offered system, CPU architecture, exposed GPU memory, tenancy and software compatibility. NVIDIA DGX B300 user guide · NVIDIA GB300 NVL72 specifications

Where vendor pages use different memory figures or bandwidth units, request the specification visible to your workload and the meaning of each metric. Do not silently combine figures from different configurations.

Verify a connected allocation and its delivery

An illustrative 128-node requirement with eight GPUs per node totals 1,024 GPUs. This is an example, not a disclosed buyer order or available inventory. Request confirmation that the nodes can run one job together at the agreed location. A fleet-wide GPU total or several separate regions is insufficient evidence.

Ask for the fabric type, effective bandwidth, topology, sharing and oversubscription; storage and checkpoint performance; and acceptance evidence across the contracted scale. A product datasheet describes a platform, while an offer must describe the service you will receive. The B300 rental brief sets out these requirements in more detail.

Use an availability record with an expiry

Keep one row per proposal: supplier and contracting entity; operator; exact platform; country and region; dedicated connected nodes; readiness state; date checked; proposed start; term; quote validity; and unresolved conditions. Ask whether readiness is operational now, installation in progress or future planned delivery. Record what is confirmed in writing and what is still unknown.

Request the same commercial inclusions from each source, including compute, fabric, storage, transfer, support and payment schedule. Use the three-year quote comparison to expose prepayment assumptions. Recheck the allocation before relying on a quote or making a commitment.

RackShore introduces buyers and suppliers. Buyers contract with and pay the supplier directly; the supplier confirms availability, pricing, delivery and infrastructure support. Send a requirement to explore a match, without assuming any supplier listed here has agreed to work with RackShore.