The seemingly never-ending onslaught of new graphics cards as of late continues today with the official release of the AMD Radeon R9 270. Like the Radeon R9 270X that came before it, the Radeon R9 270 isn't a totally new product. This mainstream graphics card actually leverages the same GPU that powered last-year's Radeon HD 7870 GHz Edition. AMD, however, has tweaked the clocks and through software and board level revisions updated the card to allow for more flexible use of its display outputs...