NVIDIA Quantum Switch-IB SB7790
The NVIDIA Mellanox Switch-IB SB7790 is a 1U unmanaged (externally managed) EDR InfiniBand switch delivering 36 ports of 100 Gb/s InfiniBand QSFP28. Providing 7.2 Tbps of non-blocking throughput with 90 nanoseconds cut-through latency, the SB7790 is designed for large compute fabrics where Subnet Management is centralized on dedicated fabric controllers or host servers. In secondary IT equipment channels, the SB7790 offers economical 100G InfiniBand connectivity for research clusters.
Specifications
| Brand | NVIDIA |
|---|---|
| Family | Quantum |
| Form factor | 1U fixed switch |
| Released | Nov 2014 |
| End of sale | Mar 2021 |
| End of support | Mar 2026 |
| Ports | 36x 100 Gb/s EDR InfiniBand QSFP28 ports |
| Switching capacity | 7.2 Tbps aggregate non-blocking switching throughput |
| Latency | 90 nanoseconds cut-through latency |
| Management | Externally managed for central Subnet Manager architectures |
| Power and cooling | Dual redundant hot-swappable AC power supplies and reversible fans |
Generations
- Next generation: NVIDIA Quantum QM8790
Compatible parts
Cables
MCP1600-E003E30 NVIDIA 100GbE QSFP28 Direct Attach Copper Cable 3m
MFS1S00-E003E NVIDIA Mellanox 100Gb/s EDR QSFP28 Active Optical Cable 3m
Transceivers
MMA1L10-CR NVIDIA Mellanox 100GbE QSFP28 SR4 Optical Transceiver
MMA1L30-CM NVIDIA Mellanox 100GbE QSFP28 CWDM4 Optical Transceiver
Works together
How the NVIDIA Quantum Switch-IB SB7790 connects to servers, storage and the network: 1 way, with the parts and products on each path.
GPU cluster fabric
InfiniBand adapters and switches must match the generation: HDR is 200Gb, NDR is 400Gb. VPI adapters such as ConnectX-6 and ConnectX-7 can run either InfiniBand or Ethernet.
Servers
HPE ProLiant DL580 Gen10 4U rack
HPE ProLiant ML350 Gen10 4U tower
HPE ProLiant XL675d Gen10 Plus 6U chassis (HPE Apollo d6500 Gen10 Plus), one XL675d per chassis
HPE Apollo 6500 Gen10 4U rack
HPE Apollo 6500 Gen10 Plus 4U rack
Lenovo ThinkSystem SD650-N V2 dense node
GPUs
NVIDIA Data Center GPU T4 PCIe low-profile half-height half-length
NVIDIA Data Center GPU Tesla V100 SXM2 32GB SXM2 module
NVIDIA Data Center GPU A100 SXM4 80GB SXM4 module
NVIDIA Data Center GPU A40 PCIe 4.0 dual-slot full-height full-length
Adapters for the server
MCX556A-ECAT NVIDIA ConnectX-5 VPI Dual-Port 100Gb/s EDR InfiniBand and 100GbE QSFP28 PCIe 3.0 x16 Adapter
MCX75310AAS-NEAT NVIDIA ConnectX-7 Single-Port 400Gb/s NDR InfiniBand and 400GbE OSFP PCIe 5.0 x16 Adapter
MCX755106AS-HEAT NVIDIA ConnectX-7 Dual-Port 200Gb/s NDR200 InfiniBand and 200GbE QSFP112 PCIe 5.0 x16 Adapter
540-BCVE Dell NVIDIA Mellanox ConnectX-6 VPI Single Port 200Gb/s HDR InfiniBand / 200GbE PCIe Adapter
Plan and size it
- Draw this setup in the topology planner mrplanb.com
- Tokens per kWh calculator for GPU racks rack-density.com
- Add up rack power and space rack-density.com
- Power, cooling and racks for dense GPU servers mrplanb.com
- Network monitoring tools compared mrplanb.com
Check compatibility with NVIDIA
Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that NVIDIA has tested with the NVIDIA Quantum Switch-IB SB7790.
- Compatibility NVIDIA Qualified System Catalog (certified GPU servers)
- Specifications NVIDIA Networking documentation (adapters, switches, cables)
- Support NVIDIA Enterprise Support
FAQ
What is the difference between SB7700 and SB7790?
The SB7700 includes an internal management CPU and Subnet Manager; the SB7790 is unmanaged and relies on external Subnet Managers.
Does the SB7790 support FDR InfiniBand devices?
Yes, QSFP28 ports auto-negotiate down to FDR (56 Gb/s) and QDR (40 Gb/s) speeds.
Buying or selling Switch-IB SB7790?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- NVIDIA Switch-IB SB7790 Product Overview, checked 2026-10-27
- NVIDIA Switch-IB SB7790 Datasheet, checked 2026-10-27