Is VGA dummy plug still needed?

[GenTarkin]

I dont know if one still needs to use VGA dummy plugs or not. From what I understand they are used for windows to detect GPU's if a monitor is not plugged into them? Or something?

I dont have that issue w/ my 5970 on my headless S939 mobo running win7 64. It saw the card just fine. I did have to flash bios to enforce proper GPU / RAM clocks though. But was all.
I plan on adding a 5830 to the same system. Same configuration ( headless ). Will I need a VGA dummy plug?

[GenTarkin]

Cool, thats what I thought I read at one point, just wanted to be sure. Thanks