http://www.stormcam.org/female-adaptor/

Can a G5 dual 1.8 Powermac have two graphics cards?
I’ve just got myself a HD TV and wanted to use the DVI output from my powermac to run it. I was looking around for a Apple VGA to DVI female adaptor to run my old dvi monitor so I can have both monitors running. They don’t seem to exist. So I decided a second graphics card would be better. Has anyone done this? Another thing I would be interested in is maybe getting a better card video card with a DVI output than than the standard for games and such. Any suggestions?
You can install as many graphics cards as you have slots for.
Those adapters can be found at places like Fry’s.
KARCHER FEMALE ADAPTOR TO ANYTHING.