What's the difference between the x540-t2 and x550-t2 ?

The X520 and X540 have a PCIe 2.0 x8 interface, which has 32Gbit/s bandwidth. The X550 has a PCIe 3.0 x4 interface, which has 32Gbit/s bandwidth. The single-port versions may be used in slower slots: X520-T1/DA1 or X540-T1/DA1 will work in a PCIe 2.0 x4 slot (at 16Gbit/s); the manual says the T550-T1 should work in a PCI 2.0 x4 slot as well, although I haven’t tried it.

Has anyone actually gotten close to the 10gbps connection speed for this card? pcie 2.0 has limit of 5 gt/s or about 4gpbs max. so can it be 10gb?

The card is PCIe 2 with x8 lanes, which is 4 GigaByte per second. 4 GigaByte is the same as 32 GigaBit, so it should handle 10 GigaBit just fine.

Will this card negotiate down to a pcie gen 3 x2? i think my only free x4 slot only runs in x2 mode which is why i'm asking.

No, please kindly note that the X550-T1 supports PCIe v3.0 (8.0GT/s) (Compatible with 2.0 and 1.1) X4/X8/X16 Lane, and it does not support X2.

does this work with windows 11?

I have not gotten it to work with windows 11. The seller says to install drivers 26.7 but those dont work

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⚡ Power your desktop with 10Gtek — where speed meets sleek sophistication!

BLAZING 10 GIGABIT SPEED - Experience lightning-fast data transfers that keep your workflow ahead of the curve.
EFFORTLESS COMPATIBILITY - Plug and play with Linux and Windows systems for instant network acceleration.
SLEEK LIGHTWEIGHT BUILD - Engineered for easy installation without adding bulk or weight to your setup.
FUTURE PROOF YOUR NETWORK - Harness Intel 82599ES chipset reliability for cutting-edge Ethernet performance.
SEAMLESS PC IE X 8 CONNECTIVITY - Maximize bandwidth with a high-performance interface built for demanding desktop environments.

The 10Gtek Ethernet Converged Network Adapter with Intel 82599ES Chip delivers ultra-fast 10 Gbps data transfer via a PCIe x8 interface. Lightweight at just 181g, it supports Linux and Windows OS, ensuring broad compatibility for desktop users seeking high-performance networking solutions.

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Brand	10Gtek
Manufacturer	10Gtek
Model	8541551539
Package Dimensions	22.61 x 15.29 x 3.2 cm; 181 g
Item model number	8541551539
Operating System	linux,windows,windows7
Hardware Interface	PCIE x 8
Compatible Devices	Desktop
Colour Screen	No
Batteries Included	No
Batteries Required	No
Data Transfer Rate	10 Gigabytes Per Second
Type of cable or wire	ethernet
Data Link Protocol	Ethernet
Connector Type	Ethernet
Includes Rechargeable Battery	No
Includes remote	No
Manufacturer	10Gtek
Item Weight	181 g

10Gtek for Intel 82599ES Chip Ethernet Converged Network Adapter X520-DA2 Intel 82599ES Chip (1 x SFP+ port)

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