USB 2.0 Vs USB 3.0 Compatibility

Do USB 3.0 connections require USB 3.0 cords to reach USB 3.0 speeds? Will any USB cord support any USB 3.0 device?

You cannot achieve USB 3.0 speeds without a USB 3.0 cable. However, speed is not the only issue.
A USB 2.0 cable will work (at USB 2.0 speeds), for some, but not all, USB 3.0 devices. There are at least three important differences in cable construction between the two standards.

Related to Speed:
      USB 3.0 cables have nine internal conductors versus four in USB 2.0 cables.
      Four of the nine internal conductors match the USB 2.0 configuration (two are for power and two are for signal). Connecting a USB 3.0 device with a USB 2.0 cable uses those conductors and operates like a USB 2.0 device.
     The other five are signal conductors which are used for the communication method that provides USB 3.0 super speed. A good general description can be found here: USB 3.0 [Wikipedia]
USB 3.0 cables have a limit of three meters versus the USB 2.0 limit of five meters.
     (Note that this is a practical limit.) The cable can be any length as long as it meets all of the electrical requirements in the specification. The three meter limit is based on maximum allowable losses using the largest recommended wire size so that the cable is flexible. Specs Document [Zip File – USB.org]

Related to Power:
     A USB 2.0 cable may not be adequate for a high current USB 3.0 device.
     Some USB 3.0 devices draw more power than USB 2.0 devices. The power conductors in USB 3.0 cables need to be able to carry 900 mA versus 500 mA for USB 2.0 cables.Additional information on USB 3.0 versus 2.0 can be found here: USB 2.0 vs. USB 3.0 [Diffen]

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