QSFP-DD 800G DAC Cable 0.5m – 800Gbps Passive Copper Interconnect for Tenstorrent Blackhole P150a & P150b

Ultra-High-Speed 800Gbps Connectivity for Next-Generation AI Accelerators

Unlock scalable artificial intelligence computing with the QSFP-DD 800G Direct Attach Copper (DAC) Cable, a high-bandwidth interconnect solution designed for compatible Tenstorrent Blackhole AI accelerator systems.

Featuring 800Gbps connectivity, QSFP-DD connectors, passive copper technology, and a compact 0.5-metre length, this cable provides a direct connection between supported Tenstorrent Blackhole Tensix processor cards.

The cable is particularly suitable for users building multi-card AI workstations, rack-mounted AI servers, machine learning research systems, and distributed accelerator configurations.

Key Features & Highlights

• 800Gbps High-Speed Connectivity – Provides an 800-gigabit-per-second link between compatible Blackhole accelerators.
• QSFP-DD Connector Interface – High-density connector technology for advanced computing hardware.
• Passive Direct Attach Copper Design – Uses a direct electrical connection without optical transceivers.
• 0.5-Metre Cable Length – Ideal for short-distance accelerator interconnections.
• Tenstorrent Blackhole Compatibility – Suitable for supported Blackhole P150a and P150b configurations.
• High-Bandwidth Data Transfer – Designed for demanding accelerator-to-accelerator communication.
• Multi-Card AI Scalability – Supports compatible distributed AI computing configurations.
• No Optical Modules Required – Integrated QSFP-DD cable ends provide direct connectivity.
• Short-Reach Interconnect – Designed for closely positioned accelerator cards and systems.
• AI Research & Server Applications – Suitable for compatible AI development infrastructure.

800Gbps High-Speed AI Interconnect Technology

Modern artificial intelligence workloads increasingly benefit from multiple interconnected accelerators.

The QSFP-DD 800G DAC cable enables supported Blackhole processors to exchange data through their dedicated high-speed interconnect ports.

Each supported Blackhole P150a and P150b accelerator includes four QSFP-DD ports, with each port providing up to 800Gbps of connectivity.

Using compatible cables and supported software configurations, developers can build multi-accelerator environments for advanced AI research.

Benefits of High-Bandwidth Connectivity

Faster Accelerator Communication

Provides a dedicated high-bandwidth physical link for supported inter-processor communication.

Scalable AI Computing

Enables compatible accelerator cards to be connected in supported multi-card topologies.

Efficient Short-Distance Connections

The 0.5m cable length is suitable for closely positioned cards and supported systems.

Simplified Interconnect Installation

Integrated QSFP-DD cable ends eliminate the need for separate optical transceiver modules.

Passive Direct Attach Copper Technology

Unlike active optical cables, a passive DAC cable uses copper conductors to establish a direct electrical connection between compatible devices.

Advantages of Passive DAC

• No separate optical transceiver modules
• Suitable for short-reach connections
• No dedicated optical conversion components
• Compact integrated connector assembly
• Straightforward installation in supported systems
• Practical for compatible high-density AI accelerator deployments

Passive DAC technology is particularly useful for short-distance links where the connected devices support the required electrical interface.

Compatible Tenstorrent AI Accelerators

Tenstorrent Blackhole P150a

The Blackhole P150a is an active-cooled AI accelerator designed for compatible desktop workstations.

It features 32GB GDDR6 memory, 120 Tensix cores, and four 800Gbps QSFP-DD interconnect ports.

The QSFP-DD 800G DAC cable can be used to connect compatible P150a cards in supported multi-accelerator configurations.

Tenstorrent Blackhole P150b

The Blackhole P150b is a passive-cooled AI accelerator designed for properly ventilated rack-mounted servers.

It also features 32GB GDDR6 memory, 120 Tensix cores, and four QSFP-DD 800G interconnect ports.

The cable supports direct connectivity between compatible Blackhole accelerator cards.

Mixed P150a and P150b Configurations

Compatible Blackhole P150a and P150b cards can be interconnected using supported QSFP-DD 800G cables and software configurations.

Important Compatibility Note: The Blackhole P100a does not feature QSFP-DD interconnect ports and therefore cannot use this cable for direct accelerator networking.

Applications & Use Cases

1. Multi-GPU Alternative AI Workstations

Connect compatible Tenstorrent Blackhole AI accelerators for specialized multi-device computing.

2. Artificial Intelligence Research

Build accelerator interconnects for supported machine learning experiments and AI research projects.

3. Large Language Model Development

Enable physical connectivity for supported distributed language model workloads.

4. Deep Learning Infrastructure

Connect compatible accelerator cards used in neural network development and research.

5. Rack-Mounted AI Servers

Use short-reach QSFP-DD DAC connections between supported Blackhole accelerator cards.

6. High-Performance Computing Research

Support specialized parallel computing configurations using compatible Tenstorrent hardware.

7. University & Research Laboratories

Create interconnected AI development environments for advanced computing education and research.

Technical Specifications

Installation & Connectivity Guidelines

Step 1 – Verify Compatibility

Confirm that both accelerator cards are supported Tenstorrent Blackhole models equipped with QSFP-DD 800G interconnect ports.

Step 2 – Power Down the System

Shut down the host workstation or server and follow the manufacturer’s installation procedures.

Step 3 – Identify QSFP-DD Ports

Locate the dedicated QSFP-DD ports on the compatible Blackhole accelerator cards.

Step 4 – Connect the Cable

Insert the QSFP-DD connectors carefully into the intended ports, ensuring they are fully seated.

Step 5 – Check Cable Routing

Avoid sharp bends, excessive tension, or obstruction of cooling airflow.

Step 6 – Configure Software

Power on the system and verify accelerator detection and interconnect functionality using supported Tenstorrent tools.

Why Choose an 800G QSFP-DD DAC Cable?

1. Ultra-High Bandwidth

Provides up to 800Gbps of connectivity per supported link.

2. Designed for AI Accelerator Scaling

Enables direct physical connections between supported Blackhole processors.

3. Passive Copper Construction

Eliminates the need for separate optical transceiver modules.

4. Compact 0.5m Length

Ideal for short-distance connections inside compatible AI computing systems.

5. High-Density Connectivity

QSFP-DD technology provides high-bandwidth interconnects in a compact connector form factor.

6. Compatible with Advanced Tenstorrent Hardware

Supports suitable P150a and P150b accelerator interconnect configurations.

Frequently Asked Questions

Q1. What is a QSFP-DD 800G DAC cable?

It is a high-speed direct-attach copper cable featuring QSFP-DD connectors and supporting 800Gbps links between compatible devices.

Q2. Is this cable compatible with Tenstorrent Blackhole P150a?

Yes, the supported 0.5m QSFP-DD 800G cable can connect compatible P150a accelerator cards.

Q3. Does it work with Blackhole P150b?

Yes, it supports compatible P150b interconnections.

Q4. Can it connect a P150a to a P150b?

Yes, supported mixed-card configurations can use compatible QSFP-DD 800G cables.

Q5. Does the Blackhole P100a support this cable?

No. The P100a does not include QSFP-DD interconnect ports.

Q6. Is this an optical cable?

No. This product is a passive direct-attach copper cable.

Q7. Does the cable require separate transceiver modules?

No. Both QSFP-DD connector ends are integrated into the cable assembly.

Q8. Can this cable be used with an 800G Ethernet switch?

Do not assume compatibility. Tenstorrent Blackhole interconnect ports are intended for connections between supported Blackhole accelerators, not standard Ethernet networking.

Q9. Can multiple cables be used in one AI system?

Yes. The number of cables required depends on the number of accelerator cards and the supported interconnect topology.

Q10. Is this cable suitable for AI servers?

Yes, when used with compatible Tenstorrent Blackhole accelerator hardware and supported server configurations.

Buy QSFP-DD 800G DAC Cable in India

Build high-performance AI infrastructure with the QSFP-DD 800G Passive Direct Attach Copper Cable.

Designed for compatible Tenstorrent Blackhole P150a and P150b AI accelerators, this 0.5m cable delivers high-bandwidth connectivity for multi-card AI computing, machine learning research, and scalable accelerator systems.

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Please confirm cable length, exact manufacturer part number, compatibility, stock availability, and warranty before ordering.