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BrandIntel
ModelEthernet Converged Network Adapter X520-SR2
Part numberX520-SR2
TypeNetwork card
ConnectorLC Connector
InterfacePCIe 2.0 x8
Ports2 x 10GbE
product_codeE10G42BFSR
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 for136 NAS models

Manufacturer notes: Intel Ethernet Converged Network Adapters (X520/X540) from Dell is not supported. 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 (33)

QNAP (103)

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