Reef Optics 400GBASE-SR8 QSFP-DD Optical Transceiver — NVIDIA Mellanox Compatible

Deliver high-density 400 Gigabit Ethernet connectivity for your data center, HPC cluster, or AI infrastructure with this Reef Optics 400GBASE-SR8 QSFP-DD transceiver. Engineered for 100% compatibility with NVIDIA Mellanox switches and NICs (replaces MMA1U00-WS / T-DQ8FNS-N00), this module provides a cost-effective alternative to OEM optics — backed by Reef Telecom's industry-leading 10-year warranty.

Key Specifications

• Form Factor: QSFP-DD (Quad Small Form Factor Pluggable Double Density)
• Data Rate: 400Gbps (8x 50Gb/s PAM4 modulation)
• Standard: 400GBASE-SR8, IEEE 802.3bs compliant
• Wavelength: 850nm (VCSEL)
• Max Distance: 70m over OM3 / 100m over OM4 multimode fiber
• Connector: MPO-16 (APC)
• Digital Diagnostic Monitoring (DDM): Yes — real-time monitoring of temperature, voltage, TX/RX power
• Breakout Support: 2x 200G-SR4 or 8x 50G-SR configurations
• Power Consumption: <10W
• Operating Temp: 0°C to +70°C (commercial)
• Compliance: MSA, QSFP-DD CMIS Rev 4.0, RoHS

Compatibility & Use Cases

Drop-in compatible with NVIDIA Mellanox ConnectX and Spectrum series switches and NICs requiring 400GBASE-SR8 QSFP-DD optics. Ideal for short-reach data center interconnects, AI/ML training clusters, high-performance computing environments, and 200G-to-400G network upgrades. Hot-swappable design enables installation without network downtime.

Free shipping on orders over $300. Every Reef Optics transceiver is backed by our 10-year warranty and tested for guaranteed compatibility.

Condition

Certified Refurbished

Warranty

10-Year Reef Telecom Warranty

Manufacturer Part Number

T-DQ8FNS-N00-M-RT

Reef SKU

T-DQ8FNS-N00-M-RT

Brand

Reef Optics

Free ground shipping on orders over $300 (contiguous US). Same-day shipping on orders placed before 4 PM EST.

All products include our industry-leading 10 Year Warranty backed by Reef Telecom.