Specifications
Ordering Code
E10G42BTDA / X520DA2
Controller
Intel 82599ES
Ports
2 × 10GbE SFP+ (SR/LR/CR optics or DAC)
Form Factor
PCIe add-in card (low profile / full height bracket options)
Host Interface
PCIe (see per-model lane/Gen detail above)
Bracket Options
Low-profile and full-height brackets supplied
Network Standards
IEEE 802.3 Ethernet; IEEE 802.1Q VLAN; IEEE 1588 PTP (model dependent)
Virtualization
SR-IOV, VMDq, MAC/VLAN filtering, 802.1Qbg edge virtual bridging
Offloads
TCP/UDP/IP checksum, TSO/LRO, RSS, DCB, FCoE/iSCSI (model dependent)
Management
PXE boot, iSCSI boot, UEFI option ROM, NC-SI (model dependent)
Operating Temperature
0 °C to +55 °C (server-class airflow required)
Compliance
RoHS, CE, FCC Class A
Source
Factory-sealed OEM / retail pack, traceable batch
Lead Time
In stock; 3-7 day dispatch for standard volumes
MOQ
1 unit (sample); volume tiers from 10 units
PCIe Host Interface
PCIe 2.0 x8 (5 GT/s)
Data Rate Per Port
10/1 GbE
Typical Power
≈ 6.2 W
FCoE
Open-FCoE and FCoE initiator supported
Lifecycle
Mature / long-life; large installed base
Target Market
Cost-sensitive 10G upgrades, legacy platform refresh
Overview
The Intel X520-DA2 is the longest-serving 10GbE server adapter in the Intel line, built on the 82599ES controller. It predates PCIe 3.0, so it is a x8 PCIe 2.0 card — still ample for two 10G ports, and frequently the cheapest route to 10G in older platforms.
Driver availability is its strongest argument: the ixgbe driver is inbox on essentially every Linux distribution, Windows Server release and ESXi build, which makes the X520 the low-risk spare-part choice for fleets built between 2012 and 2020.
Key Benefits
Lowest-cost dual 10G with full SFP+ optics support. Universal driver support via ixgbe. FCoE and iSCSI offload included. Huge installed base — predictable spares and firmware.
Applications
Legacy server refresh, homelab and SMB 10G upgrades, network monitoring/tap ports, firewall builds where driver maturity outweighs raw speed, and spare-part stocking for X520 fleets.
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