If you need faster server networking without jumping to more expensive 100Gb hardware, 25Gb Ethernet cards with SFP28 offer a smart middle ground.
Below, we focus on cards that balance throughput, compatibility, PCIe lane requirements, and real-world deployment fit for modern NAS, virtualization, and lab builds.
Best 10 25gb Ethernet Cards with Sfp28 Picks for 2026
Best for RDMA and PXE
H!Fiber 25Gb Dual SFP28 Intel E810 Card
- Intel E810 controller with RDMA, RoCEv2, PXE, and SR-IOV
- Dual SFP28 ports support 25G, 10G, and 1G per port
- Includes both low-profile and full-height brackets
Best For: Virtualization, storage, and network lab setups that need dual SFP28 ports with RDMA/PXE support.
Best for Single-Port SFP28 Upgrades
- Mellanox ConnectX-4 Lx chipset
- Single SFP28 port with 25GbE support
- RDMA, SR-IOV, and broad OS compatibility
Best For: Users upgrading a server, NAS, or lab machine with a dependable single-port 25GbE SFP28 adapter.
Best Value RDMA Pick
Mellanox ConnectX-4 25Gb SFP28 Adapter
- 25Gb SFP28 with 1/10/25Gb multi-rate support
- RDMA/RoCE, SR-IOV, DPDK, and Jumbo Frames
- PCIe 3.0 x4 fits many servers and workstations
Best For: Home NAS, small business, and lab users who want a flexible 25GbE upgrade.
Best for Low-Latency Servers
Mellanox ConnectX-5 Ex Dual SFP28 Card
- Dual 25GbE SFP28 ports
- RDMA, SR-IOV, PXE, and UEFI support
- Broad OS and server compatibility
Best For: Virtualization hosts, home labs, and small servers needing fast dual-port 25GbE networking.
Best for Intel E810 Builds
- Dual SFP28 ports with up to 25GbE speed
- Intel E810 features like SR-IOV and RDMA
- Wide support across Windows, Linux, and VMware
Best For: Intel-based servers, labs, and virtualization hosts needing dual-port 25GbE networking.
Best for Virtualization & RDMA
- Dual 25GbE SFP28 ports on PCIe 3.0 x8
- RDMA, SR-IOV, and overlay network support
- Compatible with major server OSes and DAC/AOC/transceivers
Best For: Virtualization hosts, storage servers, and RDMA-focused 25GbE setups.
Best for Virtualized 10G Copper Hosts
- 4x RJ45 10GbE with auto-negotiation
- SR-IOV, overlay offloads, and jumbo frames
- PXE/iSCSI boot plus full-height and low-profile brackets
Best For: Virtualized servers, firewalls, and NAS builds that need four copper 10GbE ports.
Best for 10G Virtualization
4-Port X710-DA4 10GbE SFP+ Card
- 4× 10G SFP+ ports for DAC and SR/LR optics
- SR-IOV, VLAN, VXLAN, and other offloads
- Includes full-height and low-profile brackets
Best For: VMware, Proxmox, Linux/KVM, and NAS users building a feature-rich 10GbE server.
Best for Dual-Port ConnectX-4 Lx
- Dual SFP28 ports for 10/25GbE networking
- ConnectX-4 Lx with SR-IOV and RoCE v2
- Includes full-height and low-profile brackets
Best For: Virtualization and storage servers that need dependable dual-port 10/25GbE networking.
Best for Virtualization
- Dual SFP28 ports for 1GbE/10GbE/25GbE links
- Mellanox ConnectX-4 Lx chipset with RDMA and SR-IOV
- Broad OS support for servers, hypervisors, and Linux
Best For: Virtualization, lab servers, and storage builds needing dual-port 25GbE.
Best for RDMA and PXE – H!Fiber 25Gb Dual SFP28 Intel E810 Card
If you’re comparing 25gb ethernet cards with sfp28, this H!Fiber model stands out for buyers who want Intel E810 performance plus dual-port flexibility. It supports 25/10/1GbE per port, includes both low-profile and full-height brackets, and is aimed at server, workstation, and lab builds that need more than basic connectivity.
Best For: Virtualization, storage, and network lab setups that need dual SFP28 ports with RDMA/PXE support.
Pros:
- Intel E810 controller with RDMA, RoCEv2, PXE, and SR-IOV support
- Dual SFP28 ports handle 25G, 10G, and 1G connections per port
- Includes both low-profile and full-height brackets for easier installation
- Broad OS support across Windows, Linux, VMware ESXi, and server distros
Cons:
- Requires SFP28 optics, DAC, or AOC cables, which add to the total cost
- Advanced features are more useful in pro or lab environments than in basic home PCs
For shoppers sorting through 25gb ethernet cards with sfp28, this is a strong fit if you want Intel-based compatibility and higher-end networking features in one card. It’s less about low-cost upgrades and more about dependable dual-port 25GbE performance for demanding workloads.
Best for Single-Port SFP28 Upgrades – Vogzone 25GbE SFP28 NIC
If you want one of the more straightforward 25gb ethernet cards with sfp28 for a server or workstation upgrade, this Vogzone card keeps the focus on essentials: a Mellanox ConnectX-4 Lx controller, a single SFP28 port, and PCIe 3.0 x4 support. It is a practical fit for users who need 25GbE connectivity, RDMA support, and broad OS compatibility without moving to a more expensive multi-port adapter.
Best For: Budget-conscious buyers who need a reliable single-port SFP28 25GbE card for NAS, virtualization, or lab networking.
Pros:
- Original Mellanox ConnectX-4 Lx chipset for proven 25GbE performance
- Supports RDMA, SR-IOV, DPDK, iSCSI, and jumbo frames
- Wide compatibility with Windows, Linux, ESXi, FreeBSD, and more
- Low-profile bracket included for compact builds
Cons:
- Single-port design limits expansion options
- Requires an SFP28 DAC or transceiver to use
- Best suited to users who already know their network stack needs
As 25gb ethernet cards with sfp28 go, this one stands out for offering a familiar Mellanox-based feature set at a simple, no-frills entry point. It is a sensible choice if you want solid compatibility and high-speed networking for storage, virtualization, or general server use.
Best Value RDMA Pick – Mellanox ConnectX-4 25Gb SFP28 Adapter
If you want one of the most practical 25gb ethernet cards with sfp28 for a home lab, NAS, or small server build, this Mellanox ConnectX-4 adapter is a strong fit. It pairs a 25Gb SFP28 port with broad speed support, RDMA features, and solid compatibility across common operating systems.
Best For: Home NAS users, small businesses, and lab builders who want a capable 25GbE upgrade with SFP28 flexibility.
Pros:
- Supports 1Gbps, 10Gbps, and 25Gbps for easy mixed-network upgrades
- Includes RDMA/RoCE, SR-IOV, DPDK, Jumbo Frames, and other advanced features
- PCIe 3.0 x4 design improves compatibility with x4, x8, and x16 slots
- Works with SFP28 DAC, AOC, and fiber module setups
Cons:
- Single-port design may not suit users who need multiple links
- Requires compatible SFP28 optics or DAC cables to reach full speed
For buyers comparing 25gb ethernet cards with sfp28, this card stands out for balancing price, features, and broad host support. It is a sensible step up when you want 25GbE performance without moving to a more expensive enterprise-focused adapter.
Best for Low-Latency Servers – Mellanox ConnectX-5 Ex Dual SFP28 Card
If you’re comparing 25gb ethernet cards with sfp28 for a server, virtualization host, or storage-heavy build, this Mellanox ConnectX-5 Ex card stands out for its RDMA support, low-latency performance, and broad compatibility. It’s a practical pick when you want fast 25GbE networking plus enterprise-friendly features without moving to a more complex platform.
Best For: Home lab owners, small servers, and virtualization setups that need fast dual-port 25GbE with RDMA and wide OS support.
Pros:
- Dual SFP28 ports deliver flexible 25GbE connectivity
- ConnectX-5 Ex adds RDMA, SR-IOV, PXE, UEFI, and 1588 PTP support
- Wide OS compatibility covers Windows, Linux, VMware ESXi, and more
- Includes both low-profile and full-height brackets for easy fitment
Cons:
- May be more card than basic desktop users need
- Requires compatible SFP28 optics, DACs, or switch ports
- Driver setup can take extra effort on some niche operating systems
This is a strong choice if you want one of the more capable 25gb ethernet cards with sfp28 for performance-sensitive workloads. Its feature set leans toward servers and labs rather than casual PC upgrades, but that’s exactly where it delivers the most value.
Best for Intel E810 Builds – Vogzone 25Gb Dual SFP28 NIC
If you need one of the more capable 25gb ethernet cards with sfp28 for a server or workstation upgrade, this Vogzone adapter is aimed squarely at Intel E810-based builds. It brings dual SFP28 ports with 1GbE/10GbE/25GbE support, PCIe 4.0 x8 bandwidth, and broad OS compatibility for data-center style networking.
Best For: Server and lab users who want an Intel E810 dual-port SFP28 NIC with RDMA, virtualization features, and strong driver support.
Pros:
- Dual SFP28 ports support 1GbE, 10GbE, and 25GbE connections
- Intel E810 controller adds SR-IOV, RDMA, DPDK, and offload features
- Compatible with Windows, Linux, VMware ESXi, and UEFI environments
Cons:
- SFP28 transceivers or DACs are not included
- Most useful in servers and workstations with PCIe 4.0 x8 support
For buyers comparing 25gb ethernet cards with sfp28, this is a strong fit if you want Intel-based reliability and advanced networking features rather than a bare-minimum port upgrade. It makes the most sense in homelabs, virtualization hosts, and storage-heavy systems where driver support and throughput matter.
Best for Virtualization & RDMA – CX4121A Dual 25Gb SFP28 NIC
If you need one of the more capable 25gb ethernet cards with sfp28 for server networking, the CX4121A is built around Mellanox ConnectX-4 Lx silicon and adds dual 25GbE ports, RDMA over RoCE, and virtualization-friendly features. It’s a practical fit for storage servers, lab racks, and cloud-style workloads where throughput and protocol support matter more than consumer extras.
Best For: Virtualization hosts, storage servers, and buyers who want dual SFP28 ports with RDMA support.
Pros:
- Dual 25GbE SFP28 ports with PCIe 3.0 x8 connectivity
- Supports RDMA, SR-IOV, VXLAN, GENEVE, and other data-center features
- Wide OS compatibility, including Windows Server, Linux, VMware, and FreeBSD
- Works with SFP28 transceivers, DAC, and AOC cabling
Cons:
- More card than a simple desktop or home-network upgrade
- Needs a matching 25GbE/SFP28 switch or direct-attach setup to shine
For buyers comparing 25gb ethernet cards with sfp28, this model stands out for server-grade features rather than raw port count alone. It’s especially compelling if you want a drop-in alternative for Mellanox-based deployments and need dependable support for virtualization and storage workloads.
Best for Virtualized 10G Copper Hosts – 4-Port 10GBASE-T X710-T4 Card
If you need a practical copper-based upgrade for a server or firewall, this quad-port adapter is a strong fit. It’s not one of the 25gb ethernet cards with sfp28 connectors, but it does make sense for buyers who want reliable 10GbE over RJ45 with broad compatibility, boot support, and hardware offloads for busy hosts.
Best For: ESXi, Hyper-V, KVM, pfSense, TrueNAS, and unRAID systems that need multiple 10GBASE-T copper ports.
Pros:
- 4x 10GbE RJ45 ports with 10G/1G/100M auto-negotiation
- SR-IOV, VXLAN/GENEVE offloads, RSS, and jumbo frame support
- PXE and iSCSI boot help in server and storage builds
- Full-height and low-profile brackets included for easier installs
Cons:
- RJ45 10GBASE-T is power-hungry compared with SFP28 fiber or DAC options
- Needs good chassis airflow to handle its higher thermal load
- Not the right choice if your goal is a 25Gb SFP28 upgrade path
Overall, this is a solid utility card for copper networks where four ports matter more than chasing higher-speed optics. If your roundup is focused on 25gb ethernet cards with sfp28, this belongs more as a practical fallback for 10GBASE-T environments than a true next-gen contender.
Best for 10G Virtualization – 4-Port X710-DA4 10GbE SFP+ Card
If you’re comparing 25gb ethernet cards with sfp28, this 4-port Intel X710-DA4-compatible card is worth a look for 10GbE builds that prioritize virtualization, storage, and flexible fiber/DAC connectivity. It uses PCIe 3.0 x8 and supports common network features like SR-IOV, jumbo frames, PXE boot, and multiple offload options, making it a practical fit for server and lab deployments.
Best For: VMware, Proxmox, Linux/KVM, Hyper-V, and NAS users who need a reliable 4-port 10G SFP+ adapter for VM-heavy or low-latency workloads.
Pros:
- 4× 10G SFP+ ports with DAC and 10GBASE-SR/LR support
- Strong virtualization features, including SR-IOV, VT-c, and VMDq
- Good fit for PXE/iSCSI boot, jumbo frames, and storage traffic
- Includes both full-height and low-profile brackets
Cons:
- Not a 25GbE SFP28 card, despite the roundup keyword
- Requires matching SFP+ optics or DAC cables
- Overkill for simple home internet upgrades
In short, this is a solid choice for buyers who actually need 10GbE density and advanced offloads rather than a true 25gb ethernet cards with sfp28 upgrade. It’s especially appealing if your priority is virtualization performance, boot support, and broad OS compatibility over maximum port speed.
Best for Dual-Port ConnectX-4 Lx – 2-Port 10/25GbE SFP28 Card
If you’re comparing 25gb ethernet cards with sfp28, this dual-port PCIe 3.0 adapter is a strong fit for servers that need flexible 10/25GbE networking without moving up to a pricier enterprise card. It uses a ConnectX-4 Lx controller, supports SFP28 optics, DAC, and AOC, and brings the offloads and low-latency features that matter for virtualization, storage, and high-traffic workloads.
Best For: VMware, Proxmox, Hyper-V, KVM, and storage servers that need reliable dual-port 10/25GbE with SR-IOV and RoCE v2.
Pros:
- Dual SFP28 ports support 10/25GbE and work with optics, DAC, and AOC cables.
- ConnectX-4 Lx adds SR-IOV, RoCE v2, and useful offloads for demanding workloads.
- Includes both full-height and low-profile brackets for easier server fitting.
- PXE/iSCSI boot support helps with deployment and datacenter use.
Cons:
- PCIe 3.0 x8 is fine for most uses, but not the newest platform on the market.
- 1GbE support depends on the module and firmware, so compatibility can vary.
- Advanced features are most useful on properly configured server environments.
For buyers focused on practical performance rather than flashy extras, this card checks a lot of boxes. Among 25gb ethernet cards with sfp28, it stands out for balanced port flexibility, virtualization support, and strong datacenter-friendly features.
Best for Virtualization – Vogzone 25GbE Dual SFP28 NIC
If you’re comparing 25gb ethernet cards with sfp28, this Vogzone card stands out for its Mellanox ConnectX-4 Lx chipset, dual SFP28 ports, and strong support for RDMA, SR-IOV, and other data-center features. It’s a practical choice when you need fast 25GbE connectivity with broad OS compatibility and virtualized workload support.
Best For: Virtualization, lab servers, and storage or networking builds that need dual-port 25GbE performance with Mellanox-based reliability.
Pros:
- Dual SFP28 ports support 1GbE, 10GbE, and 25GbE links
- ConnectX-4 Lx chipset adds RDMA, SR-IOV, DPDK, and iSCSI support
- Wide OS support, including Linux, Windows Server, VMware ESXi, and more
Cons:
- Requires SFP28 optics or DACs, which may add to total cost
- PCIe 3.0 x8 is fine for this class, but not ideal for older or limited systems
This is a strong fit if you want a feature-rich option among 25gb ethernet cards with sfp28 and plan to use advanced networking or VM acceleration features. It’s less about plug-and-play simplicity and more about getting solid Mellanox-style functionality at a competitive price.
How We Picked the Best 25gb Ethernet Cards with Sfp28
We prioritized 25gb Ethernet Cards with Sfp28 based on controller family, PCIe host interface, port count, and suitability for common server use cases. We also looked at features that matter in practice, including RDMA support, low-profile brackets, dual-port options, and compatibility with storage and virtualization workloads.
Because these adapters often ship with different OEM labels, we also favored models built on well-known chipsets such as Intel E810 and Mellanox ConnectX series, since those tend to have stronger driver support and broader ecosystem compatibility.
Quick Comparison
Use a single-port card if you only need one uplink for a workstation, router, or small server. Choose a dual-port model if you want link aggregation, separate storage and client networks, or more flexible failover options. PCIe 3.0 x4 cards can be enough for one 25Gb link, while PCIe x8 designs are a better fit for dual-port throughput and latency-sensitive workloads.
Key Buying Factors for 25gb Ethernet Cards with Sfp28
Controller and Driver Support
Start with the chipset. Intel and Mellanox-based adapters are usually the safest choice for broad OS support, mature firmware, and enterprise features. If you run Linux, Windows Server, VMware, or a mixed lab, stable driver availability matters more than raw spec sheets.
PCIe Lane Width
Check whether your system can supply enough lanes. A single 25Gb port can work on PCIe 3.0 x4 in many cases, but dual-port cards usually benefit from PCIe 3.0 x8 or PCIe 4.0 x8 to avoid bottlenecks. Always match the card to the slot bandwidth your platform actually provides.
Port Count and Cabling
SFP28 cages give you flexibility with DAC cables and fiber transceivers, which is useful in rack environments and longer runs. If your switch already uses SFP28 uplinks, these cards are a natural fit. If not, factor in transceivers, DAC length, and switch compatibility before buying.
Advanced Features
For storage, virtualization, and high-performance networking, look for RDMA, SR-IOV, jumbo frames, and low-latency design support. These features can improve efficiency, but only if your network stack and switch are configured to use them.
Who Should Buy Which 25gb Ethernet Cards with Sfp28?
Choose a single-port adapter if you want the simplest, lowest-cost path to 25Gb connectivity for one server or workstation. Pick a dual-port model if you need redundancy, separate traffic paths, or higher aggregate throughput. If your workload involves virtualization, shared storage, or heavy east-west traffic, prioritize cards with RDMA-capable chipsets and stronger PCIe headroom. For mixed environments, the safest picks are usually the Intel E810 and Mellanox ConnectX-based 25gb Ethernet Cards with Sfp28, since they offer a better balance of performance, compatibility, and upgrade flexibility.