Windows – Running a Screensaver over a dual-monitor setup

displaymultiple-monitorswindows 7

I've recently been granted a dual-monitor setup (more of a sysadmin rather than programmer, not worried about having 3) but my screensaver only runs on the primary display. I've heard about DisplayFusion and Ultramon but they are both paid software and I would have thought Windows 7 would be "intelligent" enough to do this.

I'm using the MatrixGL Screensaver, not sure if this would make any difference.