Update: Last night i once again decided that i will take another shot at it so i uninstalled the beta driver and cleaned all the files i mentioned earlier.

Installed 12.8
SDK 2.8

cgminer --scrypt -o POOL:PORT -u USERNAME -p PASSWORD --auto-fan --shaders 2048 --thread-concurrency 8192 --intensity 13 --worksize 256 -g 1 --gpu-engine 1100 --gpu-memclock 1400

I am getting  490 KH/S on avg since last night without crash. I expected better hash rate from XFX 7970 but 490 KH/S is best i have gotten without crash. If i increase gpu-memclock to 1500 (plz note default memclock for this card is 1400) computer crashes although i get on avg about 600 KH/s for like 5 minutes and as soon as temp reaches 80C computer crashes. I am  really disappointed with the performance from this XFX 7970. My computer  case is ANTEC tower with 4 fans running so i imagine there is plenty of airflow and since i am only running one 7970  i did not anticipate i would have this nightmare.