tried catalyst mobility 14.4 Beta on 6850m but can not adjust brightness (stuck at max brightness). anyone have any ideas to fix this?

U wanna stress GC or CPU

take note hmm theres ppl who says i tend to do hmm a bit on the extreme side.

prime95 avx2 version 64bit in diagnostic mode full mem custom 1hr per fft for 2-3days (depending ure cpu speed u set but it will take about that time to complete all the fft)
3dmark 11 Advance/Professional.

Set Custom Set everything maxed including ure res except AA ( AA actually reduces the load for this test) . Choose Graphic test 1. Run loop for an hour

when both stable independently run both together at the same time.

I take no responsibility for this and expect you to have sufficient cooling not only on cpu but on Ure fets on mobo and active cooling on rams and VRMS.

Don't forget to bring/buy fire extinguisher.