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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🚀 Upgrade your server’s network to lightning-fast 10GbE — because speed waits for no one!

BLAZING 10 GIGABIT SPEED - Experience ultra-fast data transfer with the Broadcom BCM57810S chipset powering your server's network backbone.
ROCK SOLID STABILITY SUPPORT - Backed by 10Gtek’s 1-year warranty and lifetime tech support, plus broad OS compatibility for enterprise reliability.
COMPACT DESIGN WITH DUAL BRACKETS - Includes standard and low-profile brackets for easy installation in full-size or small form factor servers.
PLUG PLAY PC IE 2 0 X 8 COMPATIBILITY - Fits perfectly into both PCIe x8 and x16 slots, ensuring hassle-free installation in any server chassis.
DUAL SFP PORTS FOR ULTIMATE FLEXIBILITY - Seamlessly connect with fiber modules, DAC, or AOC cables to future-proof your data center setup.

The 10Gtek Broadcom BCM57810S 10 Gigabit Ethernet Server Adapter Card delivers ultra-high-speed networking with dual SFP+ ports, PCIe 2.0 x8 compatibility, and broad OS support. Designed for data centers and professional environments, it offers flexible connectivity options, easy installation with dual brackets, and reliable performance backed by a 1-year warranty and lifetime support.

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M**H

Excellent dual 10g network

Works perfectly on Linux. Been using it with my 10g netgear switch to share the network connections with multiple VM's on KVM/libvirt. Expensive, but worth it if you need to keep at the bleeding edge of technology, otherwise an overkill. Great to play with sriov, vm's, vf's.

21.07.2021

Color	BCM57810-10G-2S(2xSFP+)
Data Link Protocol	Ethernet
Data Transfer Rate	10 Gigabytes Per Second
Compatible Devices	Server, Desktop
Hardware Connectivity	PCIE x 8

10Gtek10Gtek Broadcom BCM57810S Chipset 10 Gigabit Ethernet Sever Adapter Card (NIC), Dual SFP+ Port PCIE

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