ASUS has surprised with the release of the first consumer-grade 10GbE card at a very reasonable price of just $99, and thanks to its PCIe 3.0 x4 connection, it will fit into most modern PCs.
ASUS taps the Aquantia silicon for its XG-C100C adapter, which supports 10/5/2.5/1Gbps networking standards as well as 100Mbps (why, oh why) through normal RJ45 and Cat5e/Cat6 cabling. ASUS uses the Aquantia AQtion AQC107 controller that supports five networking standards (100M, 1G, 2.5G, 5G, and 10G) through PCIe 3.0 x4, and has LEDs for network activity and connection speeds so you're not in the dark over your 10GbE speeds.
The new 10GbE network adapter is capable of pushing 1GB/sec over your network, if it's feeding into another 10GbE machine or a 10GbE-capable NAS or switch. ASUS has its new XG-C100C available at US retailers for $99, which is a freakin' steal. Aquantia sells its own AQC107-based cards for $130, so it's actually cheaper to buy the ASUS XG-C100C, which is powered by the identical chip.