400G VR4 OSFP-RHS (Flat-top) OM4 850nm 50m MPO-12 Ethernet/InfiniBand Transceiver, MSA Compliant
The VR-4CVR4CP-AA is a 400G OSFP-RHS (Riding Heat Sink, flat-top) VR4 optical transceiver designed for NVIDIA InfiniBand fabrics and liquid-cooled GPU systems where the host platform supplies external cooling rather than relying on a module-integrated heat sink. It supports 4x 106.25 Gb/s PAM4 lanes over multi-mode fiber with VCSEL technology, delivering 400 Gb/s aggregate throughput up to 50m on OM4 (30m on OM3) via an MPO-12 APC connector.
Reference platforms: NVIDIA Quantum-2 (QM9700/QM9790) and Quantum-X800 (Q3400/Q3200) InfiniBand switches, plus ConnectX-7 / BlueField-3 endpoints in DGX H100 Cedar7 GPU systems. Compliant with OSFP MSA and IEEE 802.3ck.
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MSA Compliant
Standards-based, multi-vendor
1.6T & 800G Ready
Next-gen AI fabric optics
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- Features
- Specifications
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- FAQs
- Datasheet
- 400 Gb/s aggregate data rate (4x 106.25 Gb/s PAM4)
- OSFP-RHS (Riding Heat Sink / flat-top) form factor
- Up to 50m on OM4 / 30m on OM3 multi-mode fiber
- MPO-12 APC optical interface
- VCSEL transmitter and PIN photodiode receiver
- Designed for NVIDIA Quantum-2, Quantum-X800, Spectrum-4, Spectrum-X800
- Validated for DGX H100 Cedar7 GPU systems
- Compliant with OSFP MSA, IEEE 802.3ck, CMIS 5.0
- Full DDM telemetry over two-wire serial interface
- Single 3.3 V supply; Maximum power 8.5 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 106.25 Gb/s PAM4) |
| Wavelength | 850 nm |
| Fiber Type | OM4 / OM3 Multi-Mode Fiber |
| Distance | 50m (OM4) / 30m (OM3) |
| Connector | MPO-12 APC (female on cable side) |
| Protocol | Ethernet, InfiniBand |
| Optics | VCSEL TX / PIN PD RX |
| FEC | RS(544,514) host-side |
| Management | CMIS 5.0, DDM |
| Power Supply | 3.3 V single supply |
| Max Power | 8.5 W max |
| Temperature | Commercial (0 to 70 degC) |
| Compliance | OSFP MSA, IEEE 802.3ck, CMIS 5.0, RoHS 2 |
Q: What is the difference between OSFP-IHS and OSFP-RHS?
A: OSFP-IHS (Integrated Heat Sink, "finned-top") has a heat sink built onto the module and is used in air-cooled Ethernet switches that rely on the module to dissipate heat. OSFP-RHS (Riding Heat Sink, "flat-top") has no module-integrated heat sink - the host platform provides external cooling. RHS is used in NVIDIA Quantum, DGX, and liquid-cooled platforms.
Q: Which NVIDIA platforms is this validated on?
A: NVIDIA Quantum-2 (QM9700/QM9790), Quantum-X800 (Q3400/Q3200), Spectrum-X800 (SN6000), Spectrum-4 (SN5600) with ConnectX-7. Also validated for DGX H100 Cedar7 GPU connections and BlueField-3 endpoints.
Q: Can I use OSFP-RHS in an air-cooled Ethernet switch?
A: Generally no. Air-cooled Ethernet switches require the IHS (finned-top) variant because the module itself must dissipate heat. Using RHS without external cooling can cause overheating and link errors. Always match the form factor to the platform requirement.
Q: When should I choose VR4 over DR4?
A: VR4 for 50m or shorter on multi-mode fiber (typical in compact AI clusters and DGX pods). DR4 for 500m on single-mode fiber (typical in row-to-row InfiniBand fabrics). Match to your run length and existing fiber infrastructure.
Q: What fiber and connector should I use?
A: OM4 multi-mode fiber, MPO-12 APC connectors, Type B polarity, female (unpinned) on both ends. See the Vitex M12FOM4-B2 patch cable for direct-mate compatibility.
Q: How does this compare to NVIDIA-branded 400G optics?
A: Same optical performance and form factor, validated on the same NVIDIA platforms. Vitex delivers in.
Q: What is the typical InfiniBand use case?
A: NDR (400G) InfiniBand fabric: NVIDIA Quantum-2 / Quantum-X800 switch to ConnectX-7 NIC in a DGX or HGX system, MPO-12 APC OM4 multi-mode fiber between switch and server, 50m or shorter run.
Technical Documentation
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Every Vitex optical product undergoes optical testing, interoperability validation, and system-level verification to ensure performance, reliability, and long-term availability in production networks.
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