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BrandIntel
ModelEthernet Converged Network Adapter X520-DA2
Part numberX520-DA2
TypeNetwork card
ConnectorSFP+
InterfacePCIe 2.0 x8
Ports2 x 10GbE
product_codeE10G42BTDA
DescriptionDual-port (SFP+) 10GbE network expansion card, Intel X520, PCIe Gen2 x8, full-height bracket pre-loaded, low-profile bracket is bundled, 10GBASE-SR (short reach optical) optics included
Listed for132 NAS models

Manufacturer notes: To support HP JD097B SFP+ Cable, update your Synology product to DSM 4.2 or later. (Only applicable to models with DSM.); Intel Ethernet Converged Network Adapters (X520/X540) from Dell is not supported. Support with limitations. Please DO read the compatibility notification before your purchase. A specific bracket is required on the this models. For the information of network card installation, please refer to chapter 6 in the [Turbo NAS Hardware Manual]

Compatible NAS models

Synology (41)

QNAP (91)

Source: QNAP's official compatibility list. Always check the slot, bracket, OS version and installation notes for your NAS before buying.