Notice that the ATI 4850 (the card that Xarthor said he was looking to get) was going to consume 290 at IDLE according to the link you provided. My card (Nvidia 9800 GX2) requires a 500 watt power supply (according to the specs for the card). More than the video card will draw power, btw. So even 290 is quite a bit (at idle at that). Also, if Xarthor plans to upgrade his video card or other components at a later date he may find that he needs a bigger power supply. If so, then he spends more money because he has to replace the one he already has (if he purchases something now that is less than 500 watts). Also, RAM can slow down if the power supply is not quite sufficient for the system. More RAM: more power draw. It cannot hurt to get a larger power supply and the price difference is not always that great. I was not suggesting a 1200 watt power supply, but 500 watts or better.