Mellanox Voltaire 4036 (VLT-30011) Grid Director 36-Port QDR 40Gb/s InfiniBand 1U Switch, Dual PSU: This is a 1U managed InfiniBand switch from the Voltaire 4036 "Grid Director" line — the QDR-generation top-of-rack platform that Mellanox continued under the Voltaire brand after the 2010 acquisition. The switch provides 36 QSFP ports rated at 40Gb/s 4X QDR per port and ships in a dual-PSU chassis. It is an InfiniBand switch — not an Ethernet platform, not an FDR/EDR-rate switch, and not a director-class chassis. This unit is supplied refurbished in tested working condition.
Engineering Context. The Voltaire 4036 implements 4X QDR (40Gb/s) on each of its 36 QSFP ports, delivering a non-blocking 2.88 Tb/s aggregate switching capacity (36 ports x 40Gb/s, full-duplex). It runs the Voltaire-lineage InfiniBand management stack and supports embedded subnet manager operation for self-contained single-switch fabrics, with external SM (OpenSM) operation for larger multi-switch topologies.
Deployment & Use Cases. Typical deployments include QDR HPC clusters, MPI compute fabrics running OpenMPI or MVAPICH2 over OFED, RDMA-attached parallel storage (Lustre, GPFS) on QDR backbones, and lab and academic environments maintaining QDR-generation infrastructure. The dual-PSU 1U form factor suits standard 19-inch racks where rack space and power redundancy are both constraints.
Technical Specifications:

MPN: VLT-30011
Product Line: Voltaire 4036 Grid Director
Ports: 36 x QSFP
Per-Port Rate: 40Gb/s (4X QDR InfiniBand)
Switching Capacity: 2.88 Tb/s non-blocking
Subnet Manager: Embedded SM supported (single-switch fabrics); OpenSM for larger fabrics
Form Factor: 1U rack-mount
Power Supplies: 2 (dual)
Brand: Voltaire (Mellanox-acquired line)
Condition: Refurbished, tested

Compatibility & Constraints. Pairs with QDR-capable HCAs (Mellanox ConnectX-2 / ConnectX-3 in QDR mode) and QDR-rated QSFP copper or AOC media. The 4036 is a QDR-rate platform — it does not auto-upgrade to FDR (56Gb/s) or EDR (100Gb/s) line rates; deploying FDR/EDR HCAs against this switch will negotiate down to QDR. Embedded-SM operation is intended for single-switch fabrics; multi-switch topologies should run an external subnet manager such as OpenSM. Verify firmware revision against the OFED stack version planned for the host fleet.
Why TES. T.E.S IT-SOLUTIONS supplies tested refurbished InfiniBand switches and adapters from the Mellanox and Voltaire product families to enterprise and HPC buyers across Europe. Stock is held in our warehouse with 1–3 business day handling on confirmed orders. Request a quote for volume pricing or fabric, SM, and HCA compatibility checks.