I returned that nvidia PCI card and got the 512mb AGP card.
After installing, my computer kept shutting off.
I unplugged everything except the board and the video card. I couldn't test w/ FS9 because running the DVD-ROM shuts down the computer, but i ran the FSX demo again and my frame rate was excellent, so I think i've got that problem solved.
But anyhow, I'm guessing I have to buy a new power supply now? The video card has to be directly connected to the power supply. The box said a minimum of 270w; I have a 300w and two HDD's, DVD/RW and CD/RW drives.