As first discussed here at TweakTown, Diamond Multimedia today announced they are first out with their Viper Radeon HD 2900 XT, which comes with 1GB of GDDR-4 memory.

We are unsure on clock speeds at this stage but we have emailed the folks at Diamond and are awaiting a response - we will update this post shortly.

UPDATE: Diamond got back to us and let us know there will be two versions of the 1GB card. One with 745MHz core / 2000MHz DDR memory and the souped up version with 825MHz core and 2100MHz DDR memory.

CHATSWORTH, CA - June 14, 2007 - Diamond Multimedia, a leading provider of multimedia products, announces the release of the unique all new Diamond Viper Radeon HD 2900 XT 1GB (Gigabyte). With a unique combination of raw GPU power derived from the XBOX 360 Xenos GPU and 1GB of GDDR4 memory, the Diamond Viper Radeon HD 2900 XT 1GB sets the performance benchmark for its class.

Diamond Multimedia's new flagship graphics card is the foundation of a whole new generation of AMD/ATI Radeon Graphics. A 700 million-transistor processing powerhouse with Dynamic Game Computing technology designed to unleash the full potential of DirectX® 10 for all the action, jaw dropping effects and spectacular performance that enthusiasts crave. "AMD is a dynamic creator of this kind of technology. We have developed applications and opportunities that are unique for the 1GB card," said Bruce Zaman, CEO of Diamond Multimedia.

With a 2nd generation unified shader architecture, ultra-wide 512-bit memory interface and integrated CrossFire scalability it delivers astonishing frame rates with unprecedented visual quality and growth potential. And with built-in HDMI and multi-channel 5.1 surround audio, the Diamond Viper Radeon HD 2900XT 1GB delivers the ultimate Immersive HD Gaming experience. "This is one of the most exciting product releases we have done," said Bruce Zaman, CEO, "this is a real first in the Graphics card business and we are proud to be the first AMD partner that brings the 1GB card to the market" Zaman added.