Answer: It doesn't! Just got the Sapphire ACTIVE DP->DVI adapter in the mail and checked it out. I have the exact same result as I had previously. That is, I get a black screen on the DP connected screen even though the display is recognized and I can even go through all the steps to set up a 3x1 Eyefinity configuration. Then, when I Disable that screen, there's a "No Signal" message as the power light turns yellow. I think I'm done with these active... "NON-WORKING" adapters. Back to using the DP->VGA adapter that does do the job nicely.