When AMD announced its latest flagship, the Radeon HD 7970, we knew it was fast and efficient (because reviewers said so!), but gamers were told they'd have to wait until the new year to try it themselves. Now, precisely on schedule, the card is available for purchase, and we're starting to hear word of systems that will be refreshed to include the 28nm card. Maingear just said that it will offer the 7970 inside its