what is the total wattage of the unit. the 12v line wattage is what you have to be carefull on. you have to take the cpu waaatge and the gpu wattage add it together and then have some left over for head room. if the unit is a 300-400w unit then it going to be under sized. if you look at the evga unit the 600b if your is under sized when it onsale can be picked up for 30.00 and it not a bad unit.