You spent $80 on a DDR2 4650? Are you in the USA? You should return it, and buy something from online/newegg.com. A nice 5570 should be more then enough for your system.
Ok, i checked out some 5570's on newegg and saw one that I liked it's a SAPPHIRE Radeon HD 5570 1GB 128-bit DDR3 PCI Express 2.1 x16.
Now i'm a bit confused about the PCIE slot. I have a PCIE slot thats x16 the card says it's a PCIE 2.1 x16. I was just wondering if as long as it
says x16 will it fit.