The throughput of USB is not nearly high enough to keep up with the full demands on DVI. DVI is basically streaming bitmaps at 60 frames a second. Excusing any overhead and 1080p, that's 24bits*1080*1920*60fps and then divided by 8(bits).
That gives us 373,248,000 bytes (373 megabytes) every second.
USB 2.0 has an effective throughput of 35 MB/s
USB 3.0 has a maximum transmission speed of up to 625 MB/s
So, it is technically possible to do it on USB 3.0 without stuttering or degradation, it's still too much for two screens. And besides, video acceleration outputted through USB is going to need some serious processor overhead... unless there's some special connection I'm missing...
It's not a very feasible setup for gaming. :(
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