I am planning on buying a Dell Inspiron 580 desktop with: 2.67 GHz Quad Core i5-750 4GB DDR3 RAM 750GB 7200 RPM HDD 1GB ATi Radeon HD 5450 It has a proprietary Dell 300 Watt PSU though. Dell reprentatives said I could put any ATX PSU in and it would work fine but I don't know how to uninstall and install PSUs. What is the best graphics card I can get for a 300 Watt PSU? I have an old 8600GT so I will put that in to replace the 5450 for now but I will need a new video card. So far I have seen these cards with a 300 Watt PSU requirement: Galaxy GeForce 9800GT 512mb GDDR3 low power (core is uc to 550 from 600) nVidia GeForce 9600GT ATi Radeon HD 5670 nVidia GT 240 Which one is the best for the price and do you have other recommendations? I was thinking the GT 240 since it has 96 cores and it only costs $70. But I am still concerned about the PSU. The stock 5450 uses 20 wats under load and the cards I am looking for use 50-70 watts. Also my PSU doesn't have a 6 pin power connector so which one of these cards doesn't need a power connector besides the Low Power 9800GT and the 9600GT?