Nvdia has begun promoting its upcoming GeForce 7900 GS and 7950 GT GPUs, it appears. The graphics chip maker is pitching the G71-based parts at arch-rival ATI's upcoming Radeon X1900 Pro and X1650 XT products, according to leaked presentation slides.

The 7950 GT will launch and ship on 14 September, the company documents, posted by Chinese-language website IT.com.cn show. That's the day ATI's Radeon X1950 XTX and X1950 CrossFire edition are expected to ship following their 23 August launch. The 7900 GS will launch and ship on 30 August, the slides claim.

The 7900 GS will be clocked to 450MHz and contain 20 pixel-shader pipelines. It will support 256MB of unspecified memory clocked to 600MHz and connected across a 256-bit bus. Reference boards will provide dual-link DVI and HDTV-out. The slides stress HDCP support is an optional extra.

The 7950 GT contains 24 pixel shaders running at 550MHz. Again, the slides don't specify the memory type, but the GPU will be able to access 512MB of it clocked to 700MHz. Reference boards will provide dual-link DVI and HDTV-out connectors, and this time HDCP comes as standard. Both GPUs support Nvidia PureVideo HD technology, but the 7950 GT is likely to be promoted heavily as a Blu-ray Disc/HD DVD playback system.

The slides maintain 7950 GT-based boards will retail for around $300, while 7900 GS cards will cost approximately $200. ®