Hello right now i have an hd 5850 and have tried various drivers, my clocks go to 3d when playing games but recently i have tried bitmining(bitcoins) with my gpu and when i run guiminer my clocks stay at 2d. Does anyone now what the problem could be? occasionally after a restart my clocks will go to 3d and Mhash/s will double from 150ish(2d) to 330(3d) ish but will soon revert back to 2d. Any thoughts on those who use this program and bitcoin mine? I have thought about forcing 3d through rivatuner but if there is a more efficient way to solve the problem it would be welcome.