A few weeks back, AMD quietly released a couple of new graphics cards in the Radeon HD 5500 series. For a while there, starting with the Radeon HD 5870 in late September of last year, it seemed like AMD was releasing a new series of graphics cards aimed at different price points, practically every few weeks. Things slowed down a bit once the company had a complete top-to-bottom line-up of DX11 and Eyefinity capable cards from prices ranging from about $49 to $600, but obviously AMD wasn't quite done beefing up the Radeon HD 5000 series.

The recently released Radeon HD 5500 series cards differed from their predecessors in only one meaningful way-they were equipped with GDDR5 memory. The original 5500 series cards sported GDDR3 or GDDR2 memory. The move to GDDR5 allowed AMD to crank the memory clock speed up a bit, which would have a positive impact on overall performance...