Vitex VR-4CDR4CP-AA 400G OSFP-RHS DR4 single-mode transceiver

400G DR4 OSFP-RHS (Flat-top) SMF 1310nm 500m MPO-12 Ethernet/InfiniBand Transceiver, MSA Compliant

Name: 400G DR4 OSFP-RHS (Flat-top) SMF 1310nm 500m MPO-12 Ethernet/InfiniBand Transceiver, MSA Compliant
Brand: Vitex LLC
SKU: VR-4CDR4CP-AA
Price: 850.00 USD
Availability: InStock

Vitex Part #: VR-4CDR4CP-AA

The VR-4CDR4CP-AA is a 400G OSFP-RHS (Riding Heat Sink, flat-top) DR4 optical transceiver designed for medium-reach links in NVIDIA InfiniBand fabrics and liquid-cooled GPU systems. It supports 4x 100 Gb/s PAM4 parallel lanes over single-mode fiber, delivering 400 Gb/s aggregate throughput up to 500m via an MPO-12 APC connector.

Reference platforms: NVIDIA Quantum-2 (QM9700/QM9790), Quantum-X800 (Q3400/Q3200) InfiniBand switches, plus ConnectX-7 / BlueField-3 endpoints in DGX systems. Compliant with OSFP MSA and IEEE 802.3ck.

Features
Specifications
Applications
FAQs
Datasheet

400 Gb/s aggregate data rate (4x 100 Gb/s PAM4)
OSFP-RHS (Riding Heat Sink / flat-top) form factor
Up to 500m reach over SMF with RS(544,514) FEC
MPO-12 APC optical interface (8-fiber active)
EML transmitter and PIN photodiode receiver
Designed for NVIDIA Quantum-2, Quantum-X800, Spectrum-4, Spectrum-X800
Validated in DGX-attached InfiniBand fabrics
Compliant with OSFP MSA, IEEE 802.3ck, CMIS 5.0
Full DDM telemetry
Single 3.3 V supply; Maximum power 9 W
Commercial temperature 0 to 70 degC; RoHS 2
US-based engineering support from New Jersey HQ

Category	Optical Transceiver
Form Factor	OSFP-RHS (Riding Heat Sink / Flat-top)
Data Rate	400 Gb/s (4x 100 Gb/s PAM4)
Wavelength	1310 nm
Fiber Type	Single-Mode Fiber (SMF)
Distance	500m
Connector	MPO-12 APC (female on cable side)
Protocol	Ethernet, InfiniBand
Optics	EML TX / PIN PD RX
FEC	RS(544,514) host-side
Management	CMIS 5.0, DDM
Power Supply	3.3 V single supply
Max Power	9 W max
Temperature	Commercial (0 to 70 degC)
Compliance	OSFP MSA, IEEE 802.3ck, CMIS 5.0, RoHS 2

NVIDIA Quantum-2 (QM9700/QM9790) InfiniBand NDR Fabric NVIDIA Quantum-X800 (Q3400/Q3200) Next-Gen InfiniBand NVIDIA Spectrum-4 / Spectrum-X800 Ethernet 400G DGX System Single-Mode Connectivity ConnectX-7 / BlueField-3 400G NDR Links Medium-Reach Row-to-Row AI Cluster Fabric

Q: What is the 400G OSFP-RHS DR4?
A: A 400G medium-reach optical transceiver in the OSFP form factor with a flat-top (Riding Heat Sink) design. Supports 4x 100 Gb/s PAM4 lanes over single-mode fiber up to 500m. The flat-top is required by NVIDIA Quantum / Spectrum platforms where the system provides external cooling.

Q: Which NVIDIA platforms is this validated on?
A: NVIDIA Quantum-2 (QM9700/QM9790), Quantum-X800 (Q3400/Q3200), Spectrum-X800 (SN6000), Spectrum-4 (SN5600). Not compatible with the older Quantum (QM8700/QM8790) generation.

Q: When should I use OSFP-RHS vs OSFP-IHS?
A: RHS (flat-top) on NVIDIA Quantum / DGX / liquid-cooled platforms where the system or switch chassis provides external cooling. IHS (finned-top) on air-cooled Ethernet switches that rely on the module to dissipate heat. Mismatching causes thermal throttling.

Q: What fiber and connectors are required?
A: Standard single-mode fiber with MPO-12 APC connectors. Transceiver ports are male (pinned), cable assemblies must be female (unpinned) on both ends. Type B polarity for parallel optics.

Q: What is the optical power budget?
A: 400G-DR4 per-lane budget is approximately 4.0 dB. A 500m run consumes ~0.2 dB fiber attenuation plus ~0.7 dB across two MPO-12 APC connectors. Total ~0.9 dB - very comfortable headroom for clean assemblies.

Q: What is the typical AI cluster use case?
A: Row-to-row InfiniBand fabric on NVIDIA Quantum-2 / Quantum-X800: spine switch port to ConnectX-7 NIC in a DGX or HGX server over 100-500m SMF run with MPO-12 APC fiber. Single-mode is the future-proof choice for AI cluster expansion beyond multi-mode reach.

Q: Why Vitex over NVIDIA-branded optics?
A: Same optical performance, same validated platforms, but.

Technical Documentation

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