The system has 8G of memory. It was purchased in June of 2009.
I'm not at the system right now, and the dell service tag site for the original config does not say what the psu is, not that I can tell, but yeah I can understand power supply being a concern.
I'd like to have the card perform as well if not a bit better. Don't want to go over $125 for the card, since we plan to get another computer in the next 6 months (but will still use this one and have it is an emergency spare).