Well it was suggested I get a Sapphire 100293L Radeon HD 5570 1GB 128-bit DDR3

but the card didn't work. Either it was a dud or just not compatible. Tried it in two computers. Had to send it back to Newegg. They gave me a refund but I still need a card for the 546s inspiron. Any suggestions?

I took a look over your specs for your pc. 250w power supply limits your options.

I would try http://www.newegg.com/Product/Product.aspx?Item=N82E16814102952 since your pc comes with 1 pcie x16 slot.