I'm pretty sure that system's basically identical to mine. I havn't checked the specs on my power supply, but I know it's only 300w which is kind of small... My guess is it wouldn't work...
Find out if it takes a 20Pin ATX connector, or 24Pin ATX connector. If your not sure, i would buy a 20+/-4 pin, just to be safe. (meaning that you can use either 20 or 24).
i had a 12v/13A and im running fine on Geforce 6600Gt .. but im thinking of instoring 4 more fans .. jsut wondering how to check if my PSU is reaching its limit or not...