A few days ago, AMD announced the soon to be released HD 6990. It's a dual gpu card, 2GB's of ram per gpu. It's memory bandwidth is rated at 302.7GB/s It sucks down 400W under full load and costs about $700USD. The dual bios switch that AMD introduced with the single gpu 6950/70, on the 6990 it's a switch that allows you to overclock the hard with just a flick of the wrist. AMD now has the performance crown, granted Nvidia is still the champ of single gpu graphics cards. Nvidia has been speaking about their upcoming competing dual gpu graphics card, and I'm not sure Nvidia will be able to wrestle the performance card back.
I say this because eVGA has announced a dual gpu graphics card coined the "GTX460 2Win". http://www.evga.com/articles/00613/ It's two GF114 gpu's with 2GB's of GPU shared between the gpu pair. The memory interface has been upped from 256bit to 512bit for 230.4GB's of memory bandwidth. I have my doubts that this will take the performance crown back from AMD and their HD 6990. While I don't know if this is a one off from eVGA, of if this is Nvidia's official answer to the HD 6990. If it is the official answer, it won't win outright but where it might win is price for performance. This is where AMD normally rules the day, and it's pretty interesting for Nvidia to play the "AMD role" as I like to call it.
In short, if we find out that the GTX460 2Win is indeed Nvidia's official answer to the HD 6990, Nvidia will have pulled an "AMD", and will give the overall performance crown to AMD, for now. ;)


