Memory manufacturer Kington Technology has released a new PC9600 Memory module with a clock of 1.2Ghz. Read on in the news article. Feel free to discuss below...
Well strictly speaking, no motherboards 'support' this. A lot of motherboards don;t even officially support ~DDR2-8000.
But if the board is capable of high FSB's or has some decent memory dividers, then you should be able to run it at that speed without problems. It's really just designed to give you oodles of overclocking headroom.