It would work but since you will get same performance by your graphics inside the i3-2120 chip, the HD 3000. So there is absolutely no point of getting this card. If you are looking to buy a graphics card please give me your maximum budget. That PSU should support cards like 7750 which is the fastest of a card that can be supported by a 300W PSU. 7750 Performs like 550 Ti and it is only $100.