i got media composer 4 trial running on my old Athlon 64 3200+ sinngle core, 2gb ddr, and an ati hd4670. Boris Continuum demo works fine on it, no GPU issues at all, all video gpu effects work, rendering, scrubbing, speed is ok also...........i was pretty amazed, but thats just a test. mc4 is happily running on my workstation