Has passed a lot of time, I have achieved result in 826 (r480) megahertz but while it is obvious not a limit. I hope to reach frequency of 850 (900?) and more megahertz at use of liquid nitrogen.
http://images.people.overclockers.ru/101517.jpg
While I have as much as possible altered the power supply system of a videocard
http://images.people.overclockers.ru/102909.jpg
http://images.people.overclockers.ru/102910.jpg
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