Guide seems to have worked pretty well for me so far (Chimera is booting the HDD with Lion on absolutely fine), but I'm having issues with graphics: both the displays I have hooked up to my 570 CLASSIFIED operate at what looks like stretched 480p, but when I login and try to change them up to 1080p, some wierd artifacting occurs (looks like the display goes up to the top left corner of monitor 1) and the system hard-freezes with constant HDD activity (what). Both displays are connected via DVI->HDMI, but the problem reoccurs with direct HDMI. Additionally, a verbose boot spams a load of stuff about USB failing to connect (although I haven't attempted to troubleshoot this, will try unplugging stuff later). I multibeasted with the directions in the OP, making sure to remove NullCPUPowerManagement before the reboot.
Anyone got any ideas? Am I just doing something incredibly dumb?