larkspur :
So that some of high cost is added only when you decide to use it. They want their ports to be included in as many devices as possible and putting the gennums in the cable reduces the cost of the port implementation thus increasing the possibility that a vendor will actually include this technology.
Yes and no. From an engineering standpoint, you want the gennums further downstream in the cables to boost the signal. There's little point to do so within the PC, because it would defeat the purpose of an active cable. If it was within the PC, passive cables would be short.
Think of it the same way you would a DVI booster or a WiFi Repeater. Including those technologies at the base would help the base/host, but it wouldn't actually help transmit the signal over a longer distance.
http://en.wikipedia.org/wiki/Active_cable
On the practical side, with an active cable, you don't have to use as much copper. Reduces bulk. Longer transmission length and lower power consumption.
A Bad Day :
And if USB 3.0 is too slow, then use two of them (flashdrives in RAID 0 anyone?).
Wrong. It might actually be slower. On any given USB 3.0 mobo, two ports map to a single controller. You need to run them off two ports not sharing the same controller. Even then, seq perf might be marginally better. It depends on the USB 3.0 controller on the device side as well. Often times, it's capped round ~150 MB/s. We've seen this even from RAID-based USB 3.0 enclosures (read page 2).
bigjuliefromchicago :
Considering that the number of peripherals available is approximately zero, I'd say this theoretically great technology is practically useless.
I'm surprised you would say that. Technology always starts this way. A few devices becomes many devices. Even the most successful standards start this way. USB 3.0 won't go away. It's ubiquitous. However, Thunderbolt is the new Firewire, which was able to coexist with USB. So too will Thunderbolt.
I can't believe how narrow some other people comments are. This new standard is for high end users and later others as well once prices start to drop. USB3 eSata when you are working with files that are 10s of Gigs in size are just too slow. Thunderbolt is fast plus easy plug and play for so many future possibilities. There are already a number of hard drives, raids arrays, Displays and now expansion Link PCIe adapter from Mlogic. Already it's potential is becoming interesting.
I totally agree. Methinks not everyone read the article. Thunderbolt is on PCs! We're not dealing with just macs. External PCIe isn't going to happen in any big way (limited anyways to x1. Thunderbolt is the answer to that problem with x4 performance.
Cheers,
Andrew Ku
TomsHardware.com