Simulating a large number of displays for testing

I have a 15 display project I am setting up for and I would like to know what my frame rate will be when I use all 15 monitors.

I know there is no substitute for the real thing but right now I don’t have 15 monitors to test with. Does any one know of a way to make “virtual monitors” or otherwise emulate actually rendering that many pixels so I can see in general the difference in performance to expect when the project “goes live”?

If you have a quadro you can load edids into the outputs in the nvidia control panel which will act as if the monitors are connected. If not, look into edid detective or other small dongle-like deivces which mimic edids they are connected to.