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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10Gtek for Intel E10G42BTDA 82599ES Chip 10GbE Ethernet Converged Network Adapter X520-DA2/X520-SR2, PCI-E X8 Dual SFP+ Port

Product ID: 279400873

Details

Brand
10Gtek
Colour
X520-10G-2S
Compatible devices
Desktop
Hardware interface
PCIE x 8
Product dimensions
26.3L x 16.3W

⚡10Gbps blazing speed

🔗Dual SFP+ ports for versatile connectivity

🖥️PCI-E x8 compatible with x16 slots

Description

⚡ Power your network with 10Gtek — where speed meets seamless connectivity!

DUAL SFP PORTS - Seamlessly connect with fiber or DAC cables to meet demanding data center needs.
BLAZING 10 GBPS THROUGHPUT - Experience ultra-fast data transfer that future-proofs your network infrastructure.
FLEXIBLE PCI E COMPATIBILITY - Fits both PCI-E x8 and x16 slots, ensuring easy installation in diverse systems.
BROAD OS VIRTUALIZATION SUPPORT - Optimized for Windows, Linux, VMware, and more—perfect for modern virtualized environments.
PLUG PLAY WITH LOW PROFILE BRACKET - Includes driver CD and low-profile bracket for hassle-free setup in compact servers.

The 10Gtek X520-10G-2S is a high-performance 10GbE PCI-E x8 network adapter featuring dual SFP+ ports for versatile fiber or DAC connections. Compatible with a wide range of operating systems and virtualization platforms, it offers low latency and robust I/O virtualization support. Designed for easy installation with included driver CD and low-profile bracket, this adapter is ideal for data centers and professional setups demanding reliable, ultra-fast networking.

Specifications

ASIN	B01DCZCA3O
Best Sellers Rank	#34,853 in Computers ( See Top 100 in Computers ) #62 in Network Cards
Brand	10Gtek
Color	X520-10G-2S (2x SFP+ Slot)
Compatible Devices	Desktop
Compatible Operating System Family	Windows
Customer Reviews	4.5 4.5 out of 5 stars (243)
Data Link Protocol	Ethernet
Data Transfer Rate	10 Gigabytes Per Second
Hardware Interface	PCIE x 8
Item Dimensions L x W x H	26.3L x 16.3W x 5.5H centimeters
Item Weight	159 g
Manufacturer	10Gtek
Mfr Part Number	10Gtek X520-DA2
Model Number	X520-DA2(Intel-1pc)(UK)
Number of Items	1
Number of Packs	1
UPC	603149407824

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