The NVidia folks have been having all kinds of fun with the pending GeForce4 release. You can read a couple of articles on Yahoo and CNN about how different places have been leaking info. Here's another PR mentioning 2.6ns memory.

The new top of the range ELSA GLADIAC 925VIVO is based on NVIDIA’s new GeForce4™ Ti 4600 GPU. Equipped with a 128-MB DDR SDRAM, 2.6 ns access time and a 650MHz effective memory clock, the ELSA GLADIAC 925VIVO is aimed at extreme gamers and multimedia fans looking for state-of-the-art 3D performance.

That would make it fast. However it's also important to note that the GeForce4 MX that is shipping with the Apple machines is basically as powerful as a GeForce2. It's based on the NV17 core as opposed to the NV25 core that the higher end GeForce4 cards are (Andy's explanation here).

Will the GeForce4 be good? I'm thinking so. The GeForce3 didnt really thrill people a hell of a lot except for running higher resolutions, it was a nice little improvement but not a big reason to upgrade. The GeForce4 might be though.