You love gaming. We love gaming. It's a great match, then, when our lives converge here in the weekly Engadget giveaway. This time Diamond Multimedia has returned to offer a couple of its Radeon HD 7790 Video Graphics Cards (a $150 value each), along with a pair of DS3900 Docking Stations. The sets go out to two lucky winners, so you'll just need to head below a
