"Firmware" on a video card is usually limited to its internal BIOS that are
needed to initialize the card. Needless to say, these are normally non-free.
:)
USB 2.0 has a maximum transfer rate of 480 megabytes per second, compared to
several gigabytes per second for PCI-e. Because that's far too slow to be
useful for 3D acceleration, no USB solution for graphics has been possible.
That may change as the new USB 3.0 standard is adopted by the computer
hardware industry; USB 3.0 has a maximum theoretical transfer rate of 4.8
gigabytes per second. The Linux kernel already supports USB 3.0, unlike
Windows 7 or Mac OS X, but it will be some time until hardware manufacturers
have made the switch.
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