You have already seen how Nvidia's upcoming G92 based GeForce 8800GTS 512MB graphics card performs in stock and overclocked conditions in the past week here at TweakTown.
Nvidia has gone a step further and confirmed its specs a full one week ahead of its launch. Below is a screenshot from the Nvidia website in case they take it down.
As you already know, default clock speeds put its core clock at 650MHz with memory clock at 1000MHz and shader clock at 1625MHz which is a full 125MHz faster than the uber high-end 8800 Ultra.
For more details, visit the GeForce 8 series product page here.