Welcome to tsf. You better stick to a pci-e 1.0 card if your not sure. Pci-e 2.0 cards only work in pci-e 1.1 slots or 2.0 . If your pc does not have the 1.1 revision it will not work. So you might be safer going with a 1.0 card.
Also you will need a quality power supply 600w or higher (550w not enough) with 26 amps on the 12v rail. Stick to brands like antec , thermaltake , and corsair. Its should cost you a minimum of 60 to 70$
Also you will need a quality power supply 600w or higher (550w not enough) with 26 amps on the 12v rail. Stick to brands like antec , thermaltake , and corsair. Its should cost you a minimum of 60 to 70$