What servers is the Dell JY91H compatible with?

The JY91H ConnectX-5 CX542B is validated for Dell PowerEdge R740XD, R640, R940, and other 14G/15G servers with OCP 2.0 Type 1 slots. It integrates with iDRAC for remote management and supports standard PCIe 3.0 x8 risers for flexible installation.

What transceivers does this NIC support?

Supports 25GBASE-SR4/SR2 multimode optics, 25GBASE-LR single-mode, and direct-attach copper (DAC) cables up to 5m. Backward compatible with 10G SFP+ transceivers at reduced speed for migration scenarios.

Does it support RDMA and RoCE?

Yes, full RoCEv2, iWARP, and IBTA RDMA support with hardware offloads. Includes adaptive congestion control and PFC for lossless Ethernet fabrics essential for storage and HPC applications.

What is the OCP form factor specification?

OCP NIC 2.0 Type 1 small form factor (half-height, 1/4 length) with PCIe x8 edge connector. Hot-plug capable with standard server power delivery and SMBus management interface.

Is SR-IOV supported for virtualization?

Yes, SR-IOV with up to 127 virtual functions per port enables direct VM-to-NIC assignment in VMware vSphere, Hyper-V, and KVM, reducing hypervisor overhead for NFV workloads.

What advanced storage protocols are offloaded?

Hardware NVMe over Fabrics (NVMe-oF) target and initiator support over RoCE, plus GPUDirect Storage for direct GPU-to-SSD data paths, optimized for AI training and analytics pipelines.

JY91H - Dell JY91H CX542B 25GbE Dual-Port SFP28 OCP 2.0 NIC

Name: Dell JY91H CX542B 25GbE Dual-Port SFP28 OCP 2.0 NIC
Brand: Dell
SKU: JY91H

JY91H - Dell JY91H CX542B 25GbE Dual-Port SFP28 OCP 2.0 NIC | US IT Hardware

Product overview

The Dell JY91H is a Mellanox ConnectX-5 CX542B dual-port 25GbE SFP28 network interface card in OCP 2.0 Type 1 form factor, designed for high-performance datacenter and enterprise server deployments. Featuring PCIe 3.0 x8 interface, it delivers 25Gbps per port bandwidth with low-latency RDMA over Converged Ethernet (RoCE) and iWARP support, enabling efficient storage, HPC, and cloud workloads. Compatible with Dell PowerEdge servers including R740XD, R640, and R940, this adapter supports advanced offloads like NVMe-oF, GPUDirect, and hardware-accelerated VXLAN encapsulation for NFV/SDN environments. The SFP28 connectors accept 25GBASE-SR/ER transceivers or DAC cables, providing flexible connectivity for top-of-rack switches and storage fabrics. With ConnectX-5 EN technology, it reduces CPU utilization by offloading network processing, improving overall system efficiency and scalability in virtualized infrastructures running VMware, Hyper-V, or containers. Ideal for bandwidth-intensive applications requiring sub-microsecond latencies and high throughput, the JY91H ensures reliable performance in mission-critical environments with features like adaptive routing and congestion control.

25GbE Dual-Port SFP28 OCP NIC.
PCIe 3.0 x8 ConnectX-5 CX542B.
RoCE RDMA NVMe-oF GPUDirect.
PowerEdge R640/R740XD/R940.
50Gbps aggregate throughput.
OCP 2.0 Type 1 form factor.

Expedited and overnight shipping options are available at checkout, priced by destination and service.
Purchase orders accepted from qualified institutions.
Refunds within 14 days and replacements within 30 days of delivery with an RMA (25% restocking fee on customer-initiated returns), and every part carries our Standard 30-Day Warranty - see our return policy or contact US IT Hardware.

Featuring

Manufacturer part #	JY91H
Brand	Dell
Condition	New
MTBF	High availability datacenter rating
Model	ConnectX-5 CX542B MCX542B-ACAN
Chipset	Mellanox ConnectX-5 EN
Latency	Sub-microsecond RDMA latency
Offloads	NVMe-oF, GPUDirect, VXLAN, SR-IOV
Protocols	RoCE, iWARP, Ethernet, RDMA
Device Type	25GbE Dual-Port Network Interface Card
Compatible Servers	PowerEdge R740XD ∆ R640 ∆ R940

Compatible systems

Designed for Dell PowerEdge 14G/15G rack servers with OCP 2.0 slots. Supports enterprise OS with Mellanox OFED drivers.

Dell PowerEdge
Model: R740XD
Form factor: 2U Rack
Generation: 14th Gen
OCP 2.0 Type 1 slot required
Dell PowerEdge
Model: R640
Form factor: 1U Rack
Generation: 14th Gen
PCIe 3.0 x8 riser compatible
Dell PowerEdge
Model: R940
Form factor: 4U Rack
Generation: 14th Gen
Full OCP support with iDRAC

Best for

High-Performance Computing
HPC clusters running MPI workloads with RDMA for low-latency inter-node communication in scientific simulations and AI model training using NVIDIA GPUDirect.
Software-Defined Storage
NVMe over Fabrics (NVMe-oF) deployments with Ceph or vSAN, leveraging RoCEv2 for high-throughput block storage access in hyperconverged infrastructure.
Cloud Virtualization
VMware vSphere or KVM hypervisors with SR-IOV for VM network isolation, supporting high VM density in OpenStack or Kubernetes environments.

Details

Shipping, warranty & returns

Customer reviews

No reviews yet — be the first to review this part.

Ports	2 x 25GbE SFP28
Interface	PCIe 3.0 x8
Connector Type	SFP28 optical/DAC

Dell JY91H CX542B 25GbE Dual-Port SFP28 OCP 2.0 NIC

Product overview

Featuring

Compatible systems

Best for

Details

Shipping, warranty & returns

Customer reviews

Network & Communication

Power Consumption

Physical Characteristics

Interface/Ports

Frequently asked questions