Hello! Please add to the list of graphic cards AMD Radeon HD 6930 1GB 256 bit & AMD Radeon HD 6930 2GB 256 bit. They are engaged only in the production of HIS, Sapphire & Powercolor. These cards are only available to the markets of Russia and China, but sometimes get in other countries. Here is a link to the site of one of the vendors:
http://www.hisdigital.com/ru/product2-676.shtml.
I have some links to reviews:
http://videocardz.com/29926/powercolor-radeon-hd-6930-2gb-review-expreview
http://www.overclockers.ua/video/amd-radeon-hd6930-powercolor/