How do I find out what my Mother Board supports, and how many cards I can add? I know I have 2 free PCI slots and I am willing to remove the 56k modem in the 3rd slot because who uses 56k any more?
You really can't do anything. PCI is way way outdated, and even if you could get a setup to work, it would not be good at all. Just wait until you get a new computer.
You really shouldn't go tops tops on everything, just build something really good. There is no need to spend all your money on something that will be outdated in a year.
But unfortunately, you really cannot do anything worth doing with your current system.