Elsalamo Aleko

Sry for writing English because every day i install new windows version to solve my problem
i have problem in my power color 6950 pcs + vortex II edition i heard it is very good one and give extra cooling and stable overclocking but when i touch Ati catalyst version 11.7 in option performance graphic overdrive the ideal is (850 gpu clock) and (1300 memory clock_ . when ever i try to raise it a bit even 5 up and 5 down and raise also with it power control setting or not, i start to play or benchmark the Vega hanged and i restart my computer i don't know the wrong in my Vega or my power supply or what or it is the max performance of this vega but that will be so bad plz any one know or have it help me.

my operating system win 7 64 bit
CPU: cooler master CM II 690 plus with extra 3 fans 120mm cooler master
Motherboard: GA 980GPA-UD3H with ff bios version
power supply: cooler master 650W extreme power plus
ram: corsair xms3 4*2 giga 1600 c9
possessor: AMD phenom II X6 1055 OC@ 4 giga with cooler hyper 212 / cooler master
Hard Disk : WD 1 tera black edition