The fastest version of the NV30 will have DDR II memory running at 1000MHZ not 700 MHz to 800 MHz as many were thinking :
"As we previously said, the NV 30 will have only 128-Bit interface which is half the speed of the one used on the fastest gaming card around, ATi's Radeon 9700 PRO.
What we haven't yet mentioned is what kind of memory it sports and what is the actual clock speed of it. That’s where the surprise comes in. Assuming that the NV 30 would use standard DDR memory was a big mistake. The NV 30 will use DDR II memory, the (r)evolutionary memory marchitecture. But there's even more.
Many thought that Nvidia will use 700 MHz to 800 MHz memory which is not true, at least for the fastest implementation of chip, as we expect several cards based on same core.
The fastest NV 30 will work on the nice round number of 1000MHz, bringing graphics memory to a 1GHz speed for the first time in history.
DDR II memory at 1000MHz -- almost 400 MHz faster than the memory used on the Radeon 9700 PRO -- are key elements of the NV30's architecture that Nvidia expects will help it blow ATi's offering out of the water."