i have a new dell inspiron 580 tower, and want to replace the power supply because it is only 300W and that wont run a good graphics card. Does anyone know what a compatible psu would be? i dont want to buy one and then not have it fit! Thank you!
If you have the tower version and NOT the skinnier thin version, then it is probably ATX form factor. In that case any ATX PSU will work. I suggest the Corsair brand. Depending on your system and future uses I always suggest TX650 model, but most likely you will only need 550W or less. The TX650 model, http://www.newegg.com/Product/Product.aspx?Item=N82E16817139020
, is fairly cheap though for what you get. 5 bucks more you can get a 750W too.
If you want to spring for modular you can get that version for 20 bucks more.
IF this helps, give me a thumbs up.