Even as it stands, Thunderbolt is blisteringly fast, allowing up to 10 Gbps per lane, for a maximum throughput of 40 Gbps. Intel, though, has already upgraded Thunderbolt with the new Thunderbolt 2 spec, which not only doubles the possible transfer speed on a single lane to 20 Gbps (although not increasing total maximum throughout), but enabling 4K video file transfer and display simultaneously.
Since Thunderbolt debuted on the Mac, you’d probably expect Thunderbolt 2 to show up first in an Apple product, right? Maybe an updated Retina MacBook Pro? Alas, it’s not to be: the PC motherboard you see above is the first Thunderbolt 2 compatible product.