ConnectX vs Intel vs Broadcom Server NICs: Choosing 25G & 100G Adapters (RoCE/RDMA)
NVIDIA/Mellanox ConnectX, Intel E810/X710, and Broadcom 57xx are the three NIC families you will actually compare for 25G and 100G server networking. Here is how they differ on RDMA/RoCE, driver maturity, OEM availability, and AI/storage fit — and which to pick for your workload.
TL;DR — pick by workload
- NVIDIA/Mellanox ConnectX — the RDMA/RoCE leader. First choice for AI/GPU fabrics, NVMe-oF, and vSAN where low-latency offload matters. ConnectX-5 (25/100G), ConnectX-6 (up to 200G, stronger offloads), ConnectX-7 (400G).
- Intel (E810 / X710 / X520) — broad compatibility and rock-solid drivers. The safe default for general virtualization and mixed OS estates. E810 does 25/100G; X710 is the 10G workhorse.
- Broadcom (57xx / BCM574xx) — the OEM standard factory-fitted on many Dell and HPE servers. Reliable, well-supported, great value on the secondary market.
Per NVIDIA, ConnectX-6 brings "advanced RDMA features and higher efficiency" over ConnectX-5 (NVIDIA ConnectX adapters).
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Side-by-side
| NVIDIA/Mellanox ConnectX | Intel E810/X710 | Broadcom 57xx | |
|---|---|---|---|
| RDMA/RoCE | Best-in-class | Supported (RoCEv2) | Supported |
| Driver maturity | Strong (esp. Linux) | Excellent / universal | Excellent (OEM-tuned) |
| OEM factory fit | Common | Common | Most common on Dell/HPE |
| Sweet spot | AI, storage, HPC | General virtualization | Mainstream enterprise |
| Speeds | 10-400G | 10/25/100G | 1/10/25G mostly |
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When to pick each
Choose ConnectX when the NIC feeds GPUs (GPUDirect), an NVMe-oF or vSAN storage fabric, or any latency-sensitive HPC/AI workload. RoCE on ConnectX with a properly configured lossless fabric is the gold standard. (Pair with the right enterprise GPUs.)
Choose Intel (E810/X710) when you want maximum driver compatibility across VMware, Windows, and many Linux distros with minimal fuss — the dependable choice for general server virtualization.
Choose Broadcom when you're matching what shipped in the server (Dell/HPE often factory-fit Broadcom), want OEM firmware/iDRAC/iLO integration, or are buying cost-effective refurbished 10/25G adapters.
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RoCE: the catch everyone hits
RDMA over Converged Ethernet (RoCEv2) delivers the low latency, but it needs a lossless network — Priority Flow Control (PFC) and ECN configured end-to-end on the switches. A great ConnectX NIC on a misconfigured network won't deliver RDMA benefits. Plan the switch config alongside the NIC.
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Real inventory examples
- ConnectX-5 dual 100Gb QSFP28 (Dell 9FTMY) — AI/storage RDMA.
- Intel X710-T4L quad 10GBASE-T (Dell FWH37) — broad-compat 10G.
- Broadcom BCM57414 dual 25Gb SFP28 (HPE P53862-B21) — OEM 25G.
- Broadcom 57810S dual 10GBASE-T (Dell HN10N) — mainstream 10G.
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FAQ
ConnectX-5 or ConnectX-6 for 100G? ConnectX-5 is plenty for most 100G storage/AI today; ConnectX-6 adds higher speeds (200G) and stronger offloads if you need headroom.
Is Broadcom worse than Intel/Mellanox? No — it's the OEM default for good reason. For general traffic it's excellent; ConnectX just leads specifically on RDMA/AI.
Will any of these do RoCE? All support RoCEv2, but ConnectX has the most mature RDMA stack. The network still must be lossless.
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Pro Disk Network is an independent reseller of genuine NVIDIA/Mellanox, Intel, and Broadcom NICs (not affiliated with those vendors). Start with the server NIC fundamentals.
Source: NVIDIA ConnectX Ethernet Adapters. Pricing/availability reflect Pro Disk Network US inventory.
Which NIC for a virtual server?
Intel X710 or E810 is the general virtualization pick from the table above. At 1GbE, the Intel I350 and the Broadcom 5719 are both common quad-port server NICs: choose the one your server vendor lists for your model, since Dell and HPE ship Broadcom most often.
Network Cards
Current pricing is on each product page.
- 7C3JK: Dell Mellanox ConnectX Dual-Port 10 Gigabit SFP+ Network Interface Card
- BCM94360CD: Broadcom 802.11ac 1750Mbps Desktop PCI Express WiFi Adapter Hackintosh + BT
- 540-BFDQ: Dell Intel X710T4LOCPV3 4-Ports 10Gb/s PCI Express 3.0 x8 Plug-in Card
- AIR-CB21AG-A-K9: Cisco Aironet 802.11a/b/g Wireless Cardbus Network Adapter
- X520-DA2: Intel X520 DP 10Gb DA/SFP+ Server Adapter