you should checxk gpuz if the clocks are working correctly..i tried rbe and flashing . ccc and gpuz showered lowered clocks that what i put in rbe .
check please , maybey clock it down with ccc to stock and run the same demos and compare.. to see if rbe is changing corectly. I get my dual slot coolers in tomarow for my 2x 4850.s so i am excited to see if you got rbe to work.
Randy