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.

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 Grams
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

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

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