Nvidia is borrowing Intel's new approach to chip marketing to help it promote its upcoming GeForce Go 7800GTX

So suggest allegedly leaked company presentation slides that outline the next-generation mobile graphics part and its launch on 29 September - a week on Thursday. The slides stress the chip's "revolutionary performance per watt".

According to the slides, published (http://www.techpowerup.com/reviews/NVIDIA/G70Go/1) by TechPowerUp, the Go 7800 GTX will contains 302m transistors, some 100m of which are used to double the shader performance over the old 202m-transistor GeForce Go 6800 Ultra and raise the geometry performance by a factor of 1.6. The new chip yields double the 3DMark03 scores its predecessor did, the slides claim.

The improvements come despite a reduction in core clock speed, from the 6800 Ultra's 450MHz to 400MHz. Both chips have the same memory clock: 550MHz (1.1GHz effective). The memory is connected across a 256-bit bus. The chip delivers "99 per cent" of the performance of "shipping desktop PCs" - presumably, though this is not stated categorically, those with the desktop 7800GTX on board.

The extra transistors also equip the 7800GTX with the ability to do anti-aliasing in transparency layers. It's designed to support Windows Vista, Nvidia said.

Touting the 7800GTX's "performance per watt" - a phrase commonly spoken by Intel these days - Nvidia notes the new part will sport the latest incarnation of its PowerMizer power-conservation technology, version 6.0.

The slides claim the 7800GTX will ship with support from notebook makers Dell, Alienware, Voodoo, Sager, Falcon, Evesham, ABS, ProStar and HyperSonic. ®