I do have to buy a new power supply -lrb- mine be a 250 watt -rrb- but the product arrive quickly and install painlessly . I buy it to run Starcraft 2 , and it run on Ultra -lrb- or extreme , I can not remember -rrb- it run on the highest setting without a hiccup . the card be somewhat large due to the fan assembly -lrb- it will take up the room of two card -rrb- but it only need one slot to plug in to . it also need a 6 pin power connector from you computer 's power supply . it do not come with a converter .