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 network, upgrade your game.

DUAL SFP PORTS - Seamlessly connect with fiber or DAC cables to future-proof your data center setup.
FLEXIBLE INSTALLATION - Includes both standard and low-profile brackets to fit any server or compact workstation.
BLAZING 10 GBPS THROUGHPUT - Experience ultra-fast data transfer that keeps your network ahead of the curve.
BROADCOM POWERED STABILITY - Industry-leading BCM57810S chipset ensures reliable, jitter-free performance under heavy loads.
UNIVERSAL OS COMPATIBILITY - Plug and play with Windows Server, Linux distros, and VMware for effortless integration.

This 10Gb PCI-E NIC Network Card features the original Broadcom BCM57810S chipset and dual SFP+ ports, delivering ultra-fast 10Gbps connectivity. Compatible with major server OS platforms including Windows Server, Linux, and VMware, it supports PCI Express 2.0 x8 slots and comes with both standard and low-profile brackets for versatile installation in data centers or compact setups.

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Manufacturer	10Gtek
Part Number	BCM57810-2S(Broadcom-1pc)
Package Dimensions	22.61 x 15.29 x 3.2 cm; 249 g
Item model number	8541545746
Size	BCM57810-10G-2S(2xSFP+)
Colour	Bcm57810-10g-2s(2xsfp+)
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	249 g

10Gb PCI-E NIC Network Card, with Broadcom BCM57810S Chipset, Dual SFP+ Port, PCI Express Ethernet LAN Adapter Support Windows Server/Windows/Linux/VMware

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