Hardware Spec Index

Tessarix NX-3981 Ultra 2.5GbE RJ45 USB Adapter

Network Cards · Tessarix · SKU NX3981-ULTRA · Released 2020 · Updated 2026-10-19

Key facts

Benchmark index1,967 (Network Cards scale)
Category rank#49,375
Street price$69
Power2 W
Performance per dollar28.51
Released2020

Specifications

BrandTessarix
ModelTessarix NX-3981 Ultra
Speed2.5GbE (2.5G/1G/100M)
Ports1× RJ45
Host interfaceUSB 3.2 Gen 1 (Type-C)
CablingCat5e or better (100 m)
StandardIEEE 802.3bz (2.5G/5GBASE-T)
Jumbo framesUp to 9 KB
OffloadsTSO, checksum offload
Wake-on-LANNo
VLANIEEE 802.1Q
OS supportWindows 11, Linux, FreeBSD

Related guides

2.5GbE, 5GbE and 10GbE NetworkingPCIe Lanes Explained

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Cite this page: Hardware Spec Index, “Tessarix NX-3981 Ultra 2.5GbE RJ45 USB Adapter”, https://vextor7.com/item/7649596 (accessed 2026-10-19).