Would this work with a crossover cable, so you can avoid the (ridiculous) expense of a 10G switch if you wanted to connect only two PCs together?

The TP-Link TL-SX105 5-port 10Ggps is available now in late 2021 at a not quite so ridiculous expense of $320.

Will i get 10g speed over pcie 2.0?

PCIe1 is 250MB/sec per lane, PCIe2 is 500MB/sec per lane, PCIe3 is 800MB/sec per lane. So an x4 PCIe2 slot has..... 2Gb/sec transfer capability. 10gbe is 1.2Gb/sec transfer speeds, which falls nicely within a PCIe x4 slot. If you're computer can drive data that quickly is another question. A single consumer SATA SSD can only do 400-500MB/sec , and SATA3 can only do 600MB maximum, which is under the speed of the 10gbe. So unless you have a RAID setup with SSDs, you cannot exceed the ethernet connection. Or, a nice NVMe m.2 drive can do 3600MB/sec easily, which will hurt the 10gbe connection.

can this work as a 10gigabit connection in between 2 systems if both have one of these like from a file server to a workstation pc

Yes. That's exactly how I'm using a pair of them, between a Linux file server and desktop. I manually configured IP addresses and routes.

Is this card low profile? does it come with the low profile bracket?

The card comes with a standard size bracket but a low profile bracket is in the box.

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ASUS XG-C100C 10Gbase-T Pcie Network Adapter with Backward Compatibility of 5/2.5/1G and 100Mbps ; RJ45 Port and Built-in Qos, Red

ASUS XG-C100C 10Gbase-T Pcie Network Adapter with Backward Compatibility of 5/2.5/1G and 100Mbps ; RJ45 Port and Built-in Qos, Red

Product ID: 128871731

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Details

Brand
ASUS
Hardware Interface
Ethernet
Compatible Devices
Laptop
Data Link Protocol
Fast Ethernet
Data Transfer Rate
10000 Megabits
Item Weight
91 g

⚡10Gbps blazing speed

🔄Backward compatible 5/2.5/1G & 100Mbps

🛠️Plug & play RJ45 copper port

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Description

🚀 Upgrade your network, upgrade your game.

BLAZING 10 GBPS SPEED - Experience lightning-fast data transfers that turbocharge your workflow and gaming.
UNIVERSAL OS SUPPORT - Works flawlessly on Windows 10 and Linux kernel 4.4, giving you ultimate flexibility.
BUILT IN QO S FOR GAMING - Prioritize your gaming packets to dominate lag-free and stay ahead in every match.
RJ 45 COPPER PORT UPGRADE - Upgrade to 10Gbps speeds using your standard Ethernet cables—no costly rewiring needed.
SEAMLESS BACKWARD COMPATIBILITY - Effortlessly integrates with existing 5G, 2.5G, 1G, and 100Mbps networks—no upgrade headaches.

The ASUS XG-C100C is a high-performance 10Gbase-T PCIe network adapter designed for professionals and gamers seeking ultra-fast, reliable connectivity. It supports backward compatibility with multiple network speeds (5/2.5/1G and 100Mbps) via a standard RJ45 port, ensuring easy integration with existing infrastructure. Compatible with Windows 10 and Linux, it features built-in QoS technology to prioritize bandwidth for gaming and critical applications, making it a versatile and future-proof networking solution.

Specifications

Brand	ASUS
Manufacturer	ASUS
Item Height	4.73 Inches
Item Width	0.81 Inches
Product Dimensions	8.46 x 2.06 x 12.01 cm; 90.72 g
Batteries	1 AAAA batteries required.
Item model number	XG-C100C
Wireless Type	802.11n
Number of USB 2.0 Ports	1
Voltage	220 Volts
Wattage	5
Operating System	Linux
Are Batteries Included	No
Lithium Battery Energy Content	2.6 Watt Hours
Lithium Battery Weight	5 g
Number of Lithium Ion Cells	4
Included Components	Adapter, Warranty Card, User Manual and Software Drivers
Manufacturer	ASUS
Imported By	Rashi Peripherals
Item Weight	90.7 g

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