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BrandQNAP
ModelQXG-2G4T-I225
TypeNetwork card
Description4-port (2.5GBASE-T) 2.5Gb network expansion card; low-profile formfactor; PCIe Gen2 x 4
Ports4
ConnectorNBASE-T (RJ45)
Listed for150 NAS models

Manufacturer notes: Compatible only with PCIe slot #1. Compatible only with PCIe slot #2.  

Compatible NAS models

QNAP (150)

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