We still don’t know the clock speed of the Geforce 9800 GX2, but we do at least know that it has two G92GTS chips inside. This means that the card will feature 2x128 Shader units, which promises some nice performance.
The reference 8800GTS card works at 650MHz and traditionally Nvidia clocks its dual cards a bit slower than the single. Still, ATI surprised us all, as its dual card is clocked faster than its single RV670 card, so we are definitely in the dark here.
The card is expected in March, probably at the latest at CeBIT, which starts on March the 4th. Many Nvidia partners already promised to show these cards and it will be a major delay if Nvidia orders everyone not to show or launch the 9800 GX2. Time will tell.