I think the standard TB is copper, not optical. From Wikipedia:That, and they can actually house PCIe cards. It'll take some time to come down in price and for optical cables to become standard, but when those happen, consumer Macs will no longer be limited to their pre-config'd graphics.
The interface was originally intended to run exclusively on an optical physical layer using components and flexible optical fiber cabling developed by Intel partners and at Intel's Silicon Photonics lab. The Intel technology at the time was logically marketed under the name Light Peak, after 2011 referred to as Silicon Photonics Link. However, it was discovered that conventional copper wiring could furnish the desired 10 Gbit/s Thunderbolt bandwidth per channel at lower cost. Optical Thunderbolt cables were introduced in mid April 2012 by Sumitomo Electric Industries.
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Having a lot of ports reduces or eliminates the use of hubs. My iMac was basically that Dell; it had 2 USB hubs and multiple FireWire devices daisy-chained together. It also had an iSight camera on top of it in addition to the built-in one (I previously used it on my 2004 G5). The speakers were a little lame, so I used external ones. I had to connect SATA drives using a SATA to USB adaptor I got from China.
My big fat Mac Pro setup is a lot cleaner than my iMac setup even though the monitor and computer are separate.